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G20/ G21 3-Series
up over and around the car on the two fins on the CFRP roof along with the contours of its side sills
the plastic “jack pad” is a common weak point
high tensile strength spring alloy
and performance builds
MMX Performance Billet Coolant Expansion Cap - BMW Select Size:60mm Cap (Replaces OE Part 17117639024) G20/ G21 3-SeriesThe MMR Performance billet coolant expansion caps for BMW have been designed from the ground up in the UK, from a solid piece of billet aluminum. Each cap was designed to directly replace the OE cap, not merely stuck in place. 90mm fitment replaces OE part number 17117639021 while 60mm fitment replaces OE part number 17117639024. Each MMR cap starts life as a solid billet of 6061 aerospace grade aluminum. It's meticulously machined from this billet
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