These Ferrea valves feature a triple groove valve design and are compatible with the factory valve locks (AKA valve keepers)

E93 M3 from 2008-2013

Stress relief to prevent fatigue under extreme conditions

Beginning in the mid 1990s

BMW S63 Turbo Build Kit Kit:Level 1 These Ferrea valves feature aThe 5150 AutoSport Pro Series Turbo Build Kit: An all inclusive arsenal of internals custom assembled to prepare your BMW S63 engine for high horsepower, turbocharged performance. A Kit for Every Build and Budget There is no one size fits all, which is why we offer several stages of upgrade. Through careful selection and pairing of components, we are able to offer customers a variety of kit options, catering to each build and budget. Options: Level 1