Proven in both competitive and everyday driving conditions

carefully inspect and clean it for defects

- Any factory BMW F80/F82 M3/M4 bushings are compatible

and endurance racing

The original BMW bearings have too little clearance

5150 AutoSport Pro-Series Turbo Build Kit, BMW N55 M535i Proven in both competitive andThe 5150 AutoSport Pro Series Turbo Build Kit: An all inclusive arsenal of internals custom assembled to prepare your BMW N55 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