Increased Bore Size: Sleeving your engine gives the opportunity to increase bore size for higher displacement and increased engine capacity

this sleeve may not work

the Pro-Xtreme Connecting Rods provide peace of mind for engine builders and enthusiasts pushing the limits of their M54 engines

6D Fuel Mapping (3D table + overlay trim tables)

preventing failure under extreme conditions

Rally Road PCV Adapter Fitting for Metal Valve Covers, BMW M50 M3 Increased Bore Size: Sleeving yourBillet Aluminum PCV Adapter Fitting for 10AN hose. The SWIVEL 90 version works with both the OEM and our billet fuel rail. The STRAIGHT version for use only with the OBD2 OEM fuel rail on the M50 Intake Manifold. Note: The STRAIGHT fitting is very tight on the OBD1 Fuel Rail with OBD1 intake manifold. Rally Road recommends only the SWIVEL 90 version with OBD1 Fuel Rail or Rally Road's Billet Fuel Rail. OBD2 Fuel Rail on the OBD1 intake manifold has