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BMW Chassis Reinforcement Kits & Parts for BMW E46 M3 S54 (1999-2005)

Clear BMW chassis

Made in the USA

As much of an "Ultimate Driving Machine" it is, many BMW models unfortunately suffer from weak points in the chassis. Over the years we have uncovered many weak or failure-prone areas in the chassis and have developed our own reinforcing solutions for them. And we continue to be the leading experts on BMW chassis reinforcing. Failures can come from a number, or combination, of causes: improper maintenance, age and mileage, poor design, environmental factors, poor repair work, and over-stressing modifications. The longer you let your car go without repairing or reinforcing these areas, the closer it gets to crumbling apart. Our chassis reinforcement kits are designed to first identify potential weak points and then strengthen and reinforce the existing design.

Most of our kits are not labor intensive although welding is usually required. If you suspect your chassis may have structural problems we recommend taking it to a well-known bodyshop or restoration shop. (find out who your local BMW dealer uses - we sell many of our kits to dealer-authorized repair shops). Making the preventative fix simple and effective is better than a long and complicated repair after the failure. Our kits are not usually used for fixing existing damage (only your body shop can determine the correct course of action). But our kits have been proven under extreme conditions on racetracks around the world to prevent many of the costly - and dangerous - chassis problems.

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E46 Strut Tower Reinforcement Plates - priced each

T#:323

Part#: 51717036781

In Stock

$ 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.

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Genuine BMW Hex Bolt With Washer - 33176760336

T#:59645

Part#: 33176760336

In Stock

7% off MSRP $ 25.16

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

$ 23.49 USD

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7% off MSRP

$ 25.16

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

$ 23.49 USD

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Genuine BMW HEX BOLT WITH WASHER

Suspension Reinforcement Kit

For coupe models only

10X Entries Into Our F80 M3 Sweepstakes

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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Qty

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.

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Genuine BMW Strut Tower Bracket, Right - 51717895250

T#:16167

Part#: 51717895250

In Stock

Sale - Save 8% $ 120.99

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

$ 111.85 USD

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Sale - Save 8%

$ 120.99

This product was last offered at the strikethrough price on
08-26-2026

$ 111.85 USD

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Connects the strut brace bar to the strut tower.

GENUINE BMW BRACKET RIGHT

Genuine BMW Eccentric Bolt M12X1,5X82-10.9 - 33326863853 - E36,E46 ...

T#:179943

Part#: 33326863853

Ships in 1-2 days

3% off MSRP $ 32.99

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

$ 31.99 USD

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3% off MSRP

$ 32.99

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

$ 31.99 USD

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Genuine BMW Eccentric Bolt - M12X1,5X82-10.9
This item fits the following BMW Chassis:
E36 M3,E46 M3,E36,E46

Genuine BMW Rear subframe brace - E46 M3

T#:12733

Part#: 33312229899

Ships in 1-2 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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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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Connects the frame rails to the rear subframe - does not include hardware

Genuine BMW Rear Axle Reduced-shaft Bolt 33326760361

T#:13490

Part#: 33326760361

In Stock

10% off MSRP $ 10.27

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

$ 9.23 USD

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10% off MSRP

$ 10.27

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

$ 9.23 USD

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Genuine BMW Reduced-Shaft Bolt - M12X1,5X116-8.8
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E36,E46,E83 X3,E85 Z4,E86 Z4,E89 Z4

Genuine BMW Hex Bolt With Washer 33306760652

T#:12732

Part#: 33306760652

In Stock

$ 7.99 USD

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$ 7.99 USD

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GENUINE BMW HEX BOLT WITH WASHER FOR FRONT CONTROL ARM BUSHING BRACKET AND OTHER APPLICATIONS

Genuine BMW Rear Axle Collar Screw 33326760386

T#:12736

Part#: 33326760386

In Stock

$ 9.99 USD

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$ 9.99 USD

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Genuine BMW Collar Screw - M12X1,5X43 Zns3
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E36,E46,E83 X3,E85 Z4,E86 Z4,E89 Z4

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

2X Entries Into Our F80 M3 Sweepstakes

T#:598534

Part#: 51718413359

In Stock

$ 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.

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Genuine BMW Rear Axle Hex Bolt With Washer 33176760343

T#:13461

Part#: 33176760343

In Stock

5% off MSRP $ 8.75

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

$ 8.27 USD

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5% off MSRP

$ 8.75

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

$ 8.27 USD

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Genuine BMW Hex Bolt With Washer - M12X100-10.9
This item fits the following BMW Chassis:
E60 M5,E63 M6,E46 M3,E82 1M Coupe,E85 Z4M,E46,E63,E65,E82,E85 Z4,E86 Z4,E90,E92,E93,F22,F25 X3,F26 X4 X4,F30,F31,F32,F33,F34,F36

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Suspension Reinforcement Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:15677561

Part#: 51717036781-KT

In Stock

Sale - Save 16% $ 265.00

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

$ 221.81 USD

Add to Wish List

Qty

Sale - Save 16%

$ 265.00

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

$ 221.81 USD

Add to Wish List

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 ECS rear shock mount reinforcement plates reduce the risk of the rear shock mount area tearing and deforming. The ECS 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.

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Genuine BMW Front Axle Hex Bolt With Washer 31306779487

T#:13350

Part#: 31306779487

In Stock

8% off MSRP $ 8.54

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

$ 7.83 USD

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8% off MSRP

$ 8.54

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

$ 7.83 USD

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Genuine BMW Hex Bolt With Washer - M12X1,5X55-10.9
This item fits the following BMW Chassis:
E46 M3,E38,E46,E85 Z4,E86 Z4

Genuine BMW Hex Bolt - 07119900402 - E36,E46,E85

T#:21651

Part#: 07119900402

In Stock

$ 5.11 USD

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$ 5.11 USD

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Genuine BMW Hex Bolt
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E36,E46,E85 Z4,E86 Z4

Front And Rear Suspension Refresh Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:15777299

Part#: 33172282484-KT

Ships on Feb 22, 2027

Sale - Save 4% $ 2,847.01

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

$ 2,724.63 USD

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Qty

Sale - Save 4%

$ 2,847.01

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

$ 2,724.63 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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