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021942TMS14DBKT - Aluminum Coolant Expansion Tank Relocation Kit & Triple-Baffled Power Steering Reservoir - E82/E88 N54

Aluminum Coolant Expansion Tank Relocation Kit & Triple-Baffled Power Steering Reservoir - E82/E88 N54

Fortify your cooling and power steering systems with this exclusive Doorbuster kit! This bundle pairs Turner’s E82 N54 Aluminum Coolant Expansion Tank Relocation Kit—designed for improved durability and better engine bay packaging—with the Turner Triple-Baffled Power Steering Reservoir for consistent, foam-free fluid control under hard driving.

N54 Aluminum Coolant Expansion Tank Relocation Kit - 135i

Looking to add a hotside intake to your engine bay? Or do you have plans to go big turbo? Turner Motorsport has the solution for you. Long gone are the days of trying to find a new home in your bay for the weak, plastic coolant expansion tank that BMW puts in these cars from the factory. Turner's aluminum expansion tank relocation kit gives you a clean solution to relocate your coolant expansion tank from the hot side of your engine bay to the cold side. Not only will Turner's N54 aluminum expansion tank relocation kit free up space on the hot side of your engine bay, but it will also complete the performance look you're going for - featuring a wrinkle black powder coated expansion tank, with subtle Turner branding on the fill level indicator. Turner's N54 aluminum coolant expansion tank relocation kit is compatible with OE and aftermarket cold side intakes, as well as hot side intakes.

Everything you need to complete the installation is included in Turner's kit. Check under the documentation tab for installation instructions from Turner Motorsport.

Features:

Maintains stock coolant capacity and expansion volume Designed to maintain OE coolant elevation, preventing air pockets Baffled tank ensures that air pockets cannot be introduced during aggressive driving and provides an accurate coolant level reading Carefully designed bleed passage prevents the introduction of air as the engine cools TIG welded 5052 aluminum construction All bungs are machined to fit factory hose ends, no barb fittings here! Includes a new OE level sensor, bleeder screw, and coolant cap Tank incorporates a power steering reservoir mount Turner Triple Baffled Power Steering Reservoir - Angled Mount

The Turner triple baffled reservoir allows you to fix the downfalls of the factory BMW power steering expansion tank without losing that factory feel. The upgraded Turner reservoir has internal baffling to prevent cavitation and air pocket to make sure your rack is getting the supply of power steering. The constant flow of power steering keeps your rack cooled, lubricated and functioning properly. Extend the life of your rack and seals for years to come with increased performance and drivability. Can be used in motorsport, off-roading and daily use applications for a truly unique and universal upgrade.

Eliminates the grimy, leaky, factory BMW power steering expansion tank with a beautiful aluminum component. Increased factory power steering performance in both feel and cooling. Factory-fit with both hoses and bracketry. Additional cooling capacity will increase fluid thermal carrying capacity before overheating. Adapters where necessary to ensure reservoir will work with to-be-designed AN hose kits as well as factory hoses. Add-on, in-line valves to allow for easy flushing of power steering fluid.

Features:

Billet aluminum construction

Eliminates the leaky factory BMW reservoir and replaces it with a billet aluminum component.

Upgraded 0.45L capacity for better cooling and reduced overflow.

Internal baffles to remove bubbles caused by pump cavitation

Compatible with factory hoses and factory bracket.

Removeable Internal mesh filter

Doorbusters

T#: 47473692 | Part#: 021942TMS14DBKT

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Checking Vehicle Fitment...

$1205.98

Lifetime Replacement

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Availability:

In Stock

Est. Ship Date:

on Oct 5, 2026

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Product Details

N54 Aluminum Coolant Expansion Tank Relocation Kit - 135i

Everything you need to complete the installation is included in Turner's kit. Check under the documentation tab for installation instructions from Turner Motorsport.

Features:

Maintains stock coolant capacity and expansion volume
Designed to maintain OE coolant elevation, preventing air pockets
Baffled tank ensures that air pockets cannot be introduced during aggressive driving and provides an accurate coolant level reading
Carefully designed bleed passage prevents the introduction of air as the engine cools
TIG welded 5052 aluminum construction
All bungs are machined to fit factory hose ends, no barb fittings here!
Includes a new OE level sensor, bleeder screw, and coolant cap
Tank incorporates a power steering reservoir mount

Turner Triple Baffled Power Steering Reservoir - Angled Mount

Features:

Billet aluminum construction
Eliminates the leaky factory BMW reservoir and replaces it with a billet aluminum component.
Upgraded 0.45L capacity for better cooling and reduced overflow.
Internal baffles to remove bubbles caused by pump cavitation
Compatible with factory hoses and factory bracket.
Removeable Internal mesh filter

Prop 65 Warning

Kit Contents

Qty	Description	T#	Part#	Lifetime
1	Turner Aluminum Expansion Tank	T#568365	021942TMS01~A	YES
1	Turner Expansion Tank Wire Harness - E9X/ E8X N54	T#568366	021942TMS05~A	YES
1	N54 Aluminum Coolant Expansion Tank Relocation Kit - 135i	T#568344	021942TMS12~A	YES
1	Flared Coolant Connection Line	T#577607	013178ECS03~A	YES
1	Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4	T#640208	17117639022~BAV	YES
1	Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52	T#639793	61318360855~BAV	YES
1	O-RING, 28mm OD, 24mm ID, 2mm WIDE, BUNA-N	T#2928974	9262K189~BRP	YES
1	O-RING, 21mm OD, 17mm ID, 2mm WIDE, BUNA-N	T#2928978	9262K182~BRP	YES
4	HEX HEAD SCREW, M5 X 0.8mm X 10mm, STAINLESS STEEL	T#2928981	91287A121~BRP	YES
1	-6 ORB FITTING	T#2929019	004898LA04~A	YES
1	-10 ORB FITTING	T#2929020	003779ECS10-02~A	YES
1	Silicone Expansion Tank Relocation Heater Hose	T#21735881	053082LA01~A	YES
1	Power Steering Reservoir	T#34415626	004898LA01~D	YES
1	Angle Hose Mount	T#34415628	004898LA06~C	YES
1	Expansion Tank To Upper Radiator Hose	T#33879981	17127803838~BRP	YES

Product Q&A

Lifetime Replacement

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

Fits These Cars

MAKE	MODEL	SUBMODEL	ENGINE	Special Fitment Notes
BMW	E82	135i	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E88	135i	N54 3.0L	Use vehicle selector to confirm fitment

*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.

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Aluminum Coolant Expansion Tank Relocation Kit & Triple-Baffled Power Steering Reservoir - E82/E88 N54

Product Details

Kit Contents

Product Q&A

Lifetime Replacement

This Product Is Covered By Our Lifetime Replacement Program

Fits These Cars