Dress up your engine bay with new coolant expansion tank caps
For model years up to 2023
Dress up your engine bay with new coolant expansion tank caps
For model years up to 2023
Seals the high temp circuit expansion tank, preventing coolant and pressure loss
2X Entries Into Our F80 M3 Sweepstakes
Replacement plastic coolant reservoir for the low temp circuit that cools your intercooler
For models with the later Gen3 engines only (B58N & B48P) - Not for use with the early Gen3 engines (B58D & B46D/X)
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
09-03-2026
Functional and stunningly stylish way to add a nice touch to any engine bay
Whether you’re under the hood for a weekend project or keeping a high-performance engine in peak shape, the last thing you want to worry about is a brittle cooling system. That’s where the Rein Automotive Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
This product was last offered at the strikethrough price on
08-31-2026