Improves ring seal stability and piston motion consistency

1992 - 1999     E36 M3

2019-Present     G29     Z4 M40i

drill and tap the four outer 9mm holes in the engine block to accommodate 11mm studs and ensure even pressure distribution

Garrett G42-1200 Turbocharger

N55 Combustion Chamber Upgrade Service E39 M5 Improves ring seal stability and5150 AutoSport Combustion Chamber Upgrade Service for BMW N55 Engines Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. Our CNC Cylinder Head Combustion Chamber Service is a precision machining process where the combustion chambers of an engine's cylinder head are reshaped and refined using Computer Numerical Control (CNC) technology, optimizing engine performance for street or