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E46 Rear Chassis/Subframe Reinforcement Kit

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T#:91

Part#: TDR4675412

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Sale - Save 35% $ 193.99

This product was last offered at the strikethrough price on
06-13-2026

$ 125.49 USD

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Updated in 2020 to provide additional reinforcement! The E46 rear driveline and suspension are very similar to that of the E36. An unfortunate side effect of this is that the E46 also shares some of the same problems as the E36. One of these problems is the rear mounting points for the subframe, which can rip out from their spots in the sheet metal. This happens because the rear differential transmits the torsional load from the engine through the subframe, then into the chassis. This constant loading and unloading weakens the sheet metal and causes it to fatigue and separate from the chassis. BMW tried to fix this problem in the E46 by placing a cross member on the front two mounting points of the subframe. This cross member keeps the front mounting points from having problems by placing the bushing and the stud in double-sheer, thus reducing the twisting action on the sheet metal. The unfortunate side effect of this is that the load from the front of the subframe now gets transmitted to the left rear of the subframe. This is where we have seen many failures of the chassis on low mileage street cars and race cars. BMW has also tried to prevent the issue by injecting foam into the open space between the underside of the chassis and the top of the trunk. This seems to work but that does not address the issues of the spot welds failing on the sheetmetal. It can also make any additional work there harder and almost impossible to weld against. Our reinforcement kit has proven over and over again to be effective and the easiest to work with in the long run.

This product reinforces the chassis sheet metal at the subframe mounting points. We do this by thickening the metal and distributing the load over a larger area. This kit will save time when repairing the chassis, and is also strongly recommended as a preventative maintenance item.

Photo Gallery: E46 Subframe Failure / Repair

Click here for installation instructions.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3

E36, E46 Rear Shock Tower Mount Reinforcement Kit

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T#:3440

Part#: TSU9975100

In Stock

Sale - Save 15% $ 58.99

This product was last offered at the strikethrough price on
06-13-2026

$ 50.14 USD

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A very common weak point on the 3 series BMW is the sheetmetal of the rear shock tower. The sheetmetal here is relatively thin and very susceptible to stress and fatigue. A worn out shock will bottom-out more often and this energy is transferred through the bump stop and into the metal chassis. Stiffer shocks and shock mounts also put more stress on the sheetmetal. Factor in age, mileage, and environmental conditions and it's not a surprise that we see shock tower failures often. BMW addressed this issue with reinforcements of their own but our's are thicker for additional strength. This kit mounts on top of the shock tower and can either be bolted or welded in place. Because of the shape of the rear shock tower, these do not fit cabrio/convertible cars.

This item fits the following BMWs:
1992-1999 E36 BMW 318i 318is 318ti 323is 325i 325is 328i 328is M3 - not for convertibles
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3 - not for convertibles

E46 Front Subframe Reinforcement Kit

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T#:631

Part#: TDR4675F99

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Sale - Save 77% $ 79.99

This product was last offered at the strikethrough price on
05-03-2026

$ 18.25 USD

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The motor mount area on a subframe is one of those easily-forgotton areas that may be hiding a serious problem. The subframe on the E46 has a gusset ('ear') welded on for the motor mounts. These gussets take the stress of the motor mount as the engine torques (more upgrades = more torque = more stress). Worn motor mounts only transfer more stress to the subframe. Unfortunately, the sheetmetal will fatigue over time even though the gusset is reinforced from the factory. Check for cracks along the welds and an uneven plane from the subframe to the gusset. A total failure of the guesset will shift your engine to the side and forward, taking out many other components along the way and leading to a very costly repair.

The next time you replace the motor mounts, oil pan gasket, checking your oil pump nut, or any other time you drop the front subframe, you should install these reinforcements. This kit comes with steel reinforcing plates that are welded to the underside of the guesset as well as plates to close off the bottom of the gusset for extra strength. Instructions included.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 328i 328ci 330i 330ci M3

E36, E46, Z3 Rear Shock Mount Reinforcement (Sold Each)

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T#:578621

Part#: B3300044

In Stock

Sale - Save 17% $ 11.99

This product was last offered at the strikethrough price on
08-17-2026

$ 9.99 USD

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This is a direct replacement for the factory BMW rear shock mount reinforcement, as equipped by BMW on Z3 models. This also fits all E36 and E46 models as well. Turner Motorsport makes our own that are thicker but these can also do a good job of preventing cracks and deformation of the rear shock towers. Priced per reinforcement plate. Order 2 to cover both rear shock towers. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty. This item fits the following BMWs: 1992-1999 E36 BMW 318i 318is 318ti 318ic 323is 325i 325is 328i 328is M3 (not for convertible models) 1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3 (not for convertible models) 1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe

E46 Strut Tower Reinforcement Plates - priced each

T#:323

Part#: 51717036781

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$ 57.99 USD

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$ 57.99 USD

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Like the E36 before it, the front strut towers on the E46 are notoriously weak. Under normal driving conditions with a stock, fresh suspension it is unlikely that you will ever have a problem. But with an upgraded street or race suspension with firm springs much of the energy from pounding the road is transmitted to the thin sheet metal in the strut tower. This pounding will cause the tower to deform or even crack. Look for 'mushrooming' or deformity around the holes for the three mounting studs at the top of the strut tower. The sheetmetal around the holes should really be flat and square. Poor shocks or stiff suspensions will actually cause this sheetmetal to pop up.

These factory BMW reinforcement plates will help disperse the energy and save you from costly repairs in the future. A strut brace also helps to prevent this but these plates are designed to reinforce the strut tower from the bottom. The install over your strut mount or camber plate and simply add thickness (strength) to the strut tower. They can be sandwiched in place and do not require welding.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
2001-2006 E46 BMW M3*
* - The stock M3 upper strut mount already does a good job of dispersing the loads of the suspension. These reinforcement plates will fit a stock mount for added strength but need to be trimmed to fit inside the strut tower. The are very strongly recommended for all M3s with coil over suspensions because aftermarket coil overs typically have a smaller surface area for their strut mounts.

Rear Shock Mount Reinforcement Plate - Priced Each - E30 E36 E46 Z3 ...

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T#:598534

Part#: 51718413359

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$ 12.99 USD

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$ 12.99 USD

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Discover the Turner Motorsport URO Rear Shock Mount Reinforcement Plate, individually priced for E30, E36, E46, and Z3 BMW models. This mounting plate provides essential support at the rear shock mounting point, enhancing stability and durability. Engineered by URO, renowned for quality auto parts, this reinforcement plate is designed to address and prevent issues related to the rear shock mounting, ensuring a reliable and secure connection for a variety of BMW models.

Individually priced for cost-effective customization.
Enhances support at the rear shock mounting point.
Designed for E30, E36, E46, and Z3 BMW models.
URO quality ensures durability and reliability.
Addresses and prevents issues related to rear shock mounting.

Upgrade your BMW's rear shock mounting system with the Turner Motorsport URO Rear Shock Mount Reinforcement Plate for increased stability and longevity.

4mm Heavy Duty Rear Shock Mount Reinforcement Plate Set

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T#:376177

Part#: 002478ECS01KT

In Stock

Sale - Save 25% $ 85.99

This product was last offered at the strikethrough price on
06-13-2026

$ 64.48 USD

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This product was last offered at the strikethrough price on
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$ 64.48 USD

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A very common weak point on the 3 series BMW is the sheetmetal of the rear shock tower. The sheetmetal here is relatively thin and very susceptible to stress and fatigue. A worn out shock will bottom-out more often and this energy is transferred through the bump stop and into the metal chassis. Stiffer shocks and shock mounts also put more stress on the sheetmetal. Factor in age, mileage, and environmental conditions and it's not a surprise that we see shock tower failures often. BMW addressed this issue with reinforcements of their own but our's are thicker for additional strength. This kit mounts on top of the shock tower and can either be bolted or welded in place. Because of the shape of the rear shock tower, these do not fit cabrio/convertible cars.

Heavy Duty Convertible Rear Shock Mount Reinforcement Plate Set ...

For convertible models only

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T#:376176

Part#: 002478ECS02KT

In Stock

Sale - Save 25% $ 95.98

This product was last offered at the strikethrough price on
06-13-2026

$ 71.98 USD

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$ 71.98 USD

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The upper rear shock bolts to the sheetmetal in the folding top well on convertible models. As the mileage goes up more and more stress is put on this sheetmetal and it can actually tear away from the rest of the chassis. Look for lttle cracks originating from the mouning holes. This reinforcement plate helps spread the shock loads around the sheetmetal and reduce stress in localized areas. Price is for the pair.

Suspension Reinforcement Kit

For coupe models only

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T#:5416754

Part#: 51717036781TMSKT

In Stock

Sale - Save 16% $ 265.00

This product was last offered at the strikethrough price on
04-03-2026

$ 221.81 USD

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Includes RTAB limiter, rear shock tower reinforcement plates and BMW Strut tower plates. If you already upgraded your suspension but are looking for the finishing touch, this kit is what you need. The BMW front strut mount reinforcement plates reduce the risk of the shock tower mushrooming and cracking. The rear shock mount reinforcement plates reduce the risk of the rear shock mount area tearing and deforming. The Delrin rear trailing arm bushing limiters reduce the movement that the RTAB's can make resulting in a tighter rear suspension and with less moment prolongs the bushing life.

Genuine BMW Strut Tower Bracket, Right - 51717895250

T#:16167

Part#: 51717895250

In Stock

2% off MSRP $ 123.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 120.99 USD

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2% off MSRP

$ 123.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 120.99 USD

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Rear Subframe Reinforcement Kit

T#:397247

Part#: 13-005

Ships in 4 Business Days

5% off MSRP $ 149.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 142.00 USD

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5% off MSRP

$ 149.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 142.00 USD

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One of the most common issues with the E46 is that the subframe likes to tear away from the chassis. Fix this by welding in a Rear Subframe reinforcement kit.

Includes all necessary reinfored metal plates
Professional installation is required
Suspension must be realigned after installation

Fits the following BMWs:
1998 - 2006 E46 320i 323i 325i 325xi 328i 330i 323ci 325ci 330ci M3

Genuine BMW Rear subframe brace - E46 M3

T#:12733

Part#: 33312229899

Ships in 3 Business Days

2% off MSRP $ 434.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 425.99 USD

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$ 434.99

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$ 425.99 USD

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Rogue Engineering V-Brace Chassis Support - E46 M3

T#:12643107

Part#: RE.899

Ships in 10 Business Days

$ 595.00 USD

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$ 595.00 USD

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An integral part on E46 M3 is the rear chassis "V-Brace" (BMW # 33312229899) found on all 2001-06 Convertibles and Coupe (including the CSL). This brace attaches to the outward points of the rear chassis and to the area near the rear subframe carrier. Since some of these vehicles are now over 20 years old, we have been seeing more and more of these start to rust away. We began studying the OEM part, curious as to why they were starting to rust away. We found that the two arms of the "V" are made from 38mm x 12mm (1.5" x 0.5") hollow square steel tubing, pressed ends and welded to a junction plate joining them with welds holding the arms at a specific angle. Since the arms are hollow, it helps keep the overall weight down, but does little to prevent corrosion since it is difficult to paint/coat a hollow tube. A Google search turned up very little other than used ones on eBay and new ones that turned out to be in short supply from the BMW dealer (not surprising since the car is over 20 years old). Determined to make something better, we began our engineering and R&D process. Goals of our Design; Modular design, since packaging and shipping something this large would probably be too expensive Costs would dictate material and manufacturing methods Lighter weight would be a secondary (or tertiary) goal, but also keeping in mind costs Corrosion resistant, so it would not rust from the inside out, like the OEM version After weighing the material, manufacturing and cost options, we decided to go with a fully CNC'd ACQ 6061-T6 aluminum assembly. The concept is to machine two identical arms (one part number) and have them joined with a "junction plate". The arms would be secured to the plate with Grade 8.8 grade hardware and the entire assembly would include replacement Grade 10.9 hardware to replace the original OEM hardware (which is probably original). Details of our Design; CNC'd 6061-T6 construction, secured with Grade 8.8 socket head cap screws. Included are replacement Grade 10.9 hardware to fit in the factory locations. About 4 lbs. fully assembled weight (vs. 6.25 lbs for OEM), about a 35% weight savings Anodized gray finish Modular design allows for one arm to be removed in case of exhaust removal requirement. Included in the Kit Two (2) arms of the brace assembly (they are idential) One (1) junction plate One (1) red spacer (this goes BETWEEN the brace and the chassis!) Two (2) blue spacers (these goes BETWEEN the brace and the chassis!) Four (4), M10 socket head cap screws Three (3), M10 flanged hex head bolts It is recommended that the holes used to mount the V-brace onto the car be cleaned before installation by running an M10x1.5 tap to clean each of the holes.

Front And Rear Suspension Refresh Kit

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T#:15777299

Part#: 33172282484-KT

Ships on Mar 8, 2027

Sale - Save 5% $ 2,847.01

This product was last offered at the strikethrough price on
06-18-2026

$ 2,706.88 USD

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Symptoms of a worn suspension include a loose and imprecise feel to the steering, excessive shaking through the steering wheel, or sounds like squeaking, grinding or clunking. This kit will not only help address these issues but is designed to have superior performance compared to stock, and extend suspension life. Level 3 includes: 2 front control arms 2 front Polyurethane control arm bushings 4 sway bar end links 2 tie rod assemblies 2 strut mounts 2 strut mount reinforcement plates 2 Heavy Duty ECS rear shock mount reinforcement plates 2 rear upper control arm bushings 2 camber arm bushings 4 lower trailing arm ball joint 1 differential bushing 4 rear subframe bushings 4 ECS RTAB limiters 2 trailing arm bushings 2 rear shock mounts 2 rear shock mount gaskets

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Showing 14 results for "chassis reinforcement"

E46 Rear Chassis/Subframe Reinforcement Kit

E36, E46 Rear Shock Tower Mount Reinforcement Kit

E46 Front Subframe Reinforcement Kit

E36, E46, Z3 Rear Shock Mount Reinforcement (Sold Each)

E46 Strut Tower Reinforcement Plates - priced each

Rear Shock Mount Reinforcement Plate - Priced Each - E30 E36 E46 Z3 ...

4mm Heavy Duty Rear Shock Mount Reinforcement Plate Set

Heavy Duty Convertible Rear Shock Mount Reinforcement Plate Set ...

Suspension Reinforcement Kit

Genuine BMW Strut Tower Bracket, Right - 51717895250

Rear Subframe Reinforcement Kit

Genuine BMW Rear subframe brace - E46 M3

Rogue Engineering V-Brace Chassis Support - E46 M3

Front And Rear Suspension Refresh Kit

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