please note 6-8 week lead time

- If the under-car regulator is not used

For advanced builds using an aftermarket throttle body

resulting in an average of 50% more pedal pressure

Cylinder Head O-Ringing Service, 8-Cylinder BMW Engines M40B18 please note 6-8 week lead5150 AutoSport Cylinder Head O Ring Installation Service for 8 Cylinder BMW Engines O ringing an engine cylinder head for high performance, high boost turbo applications provides several mechanical advantages. These advantages primarily focus on improving the engine's sealing capabilities and durability under extreme conditions. Price includes head resurfacing and wash. Key mechanical benefits of O ringing an engine cylinder head: 1. Superior Sealing: