Future design FD V1 Carbon Fiber REAR SPOILER for Mercedes Benz E-Class E43 E53 E63 W213 2017-ON
$360
When you increase the RPM range and boost of the car, the stock valve spring will start to "float". Our 82# valve springs and titanium retainers will keep the valves from floating so you can make more power reliably.?
.500" coil bind, 82# seat pressure 200# at .420" lift.
Stock Valve Springs are #58?
William Rodriguez - 2024-03-03
The quality of the product is exceptional, and it arrived much quicker than I expected. Excellent customer service as well.