Product Details

Hotside intakes are a very common modification for N54 powered BMWs. Here at Turner Motorsport, we found ourselves unsatisfied with all existing solutions to relocate the coolant expansion tank to the cold side of your engine bay, freeing up real estate on the hot side. We decided to make an end all be all solution for people looking to relocate your expansion tank that's compatible with both hotside intakes and factory location coldside intakes. All CAD designed in-house, our N54 aluminum expansion tank relocation kit allows you to seamlessly mount our new aluminum expansion tank on the cold side of your engine bay.

During the design process, we did everything possible to ensure no air pockets could develop in the cooling system even during spirited drives. The baffled tank is all TIG welded 5052 aluminum construction, featuring a carefully designed bleed passage. We also machined all of our bungs to accept OEM hose ends, to keep the fit and finish as OE+ as possible. Keeping with this same mindset, we made sure that coolant elevation matches OE exactly, and integrated a power steering pump reservoir mount. Our aluminum expansion tank accepts the OE coolant level sensor, bleeder screw, and coolant cap, but we include new ones with this kit, as we thought you should replace them during installation. See more about these features in the list below.

Find our Turner Aluminum Expansion Tank Installation Guide HERE

Features and benefits:

• TIG welded 5052 aluminum construction, wrinkle black powder coated
• Utilizes factory coolant capacity and expansion volume
• CAD designed to retain OE coolant elevation, which prevents air pockets
• Baffled tank ensures that air pockets will not be created under spirited driving conditions, and ensures accurate coolant level reading
• Meticulously designed bleed passage prevents air pockets while the engine cools
• All bungs machined for factory hose end compatibility (no barb fittings!) 
• Integrated power steering reservoir mount
• Kit includes Turner Motorsport aluminum expansion tank, Turner Motorsport wiring harness, all necessary hoses, hardware, OE level sensor, bleeder screw, and coolant cap

This product fits the following BMWs:

E9x 335i 335i 335xi 335is (N54)

*NOTE: This aluminum expansion tank is only for N54 powered 335i vehicles. If you are looking for the Turner Motorsport aluminum coolant expansion tank relocation kit for your 135i, see T#568368

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