B58 Closed Deck Cylinder Head Mod 13641363918 Engineered to handle the stress

Engineered to handle the stress of high RPM

4mm ID-Vacuum hose Y-fitting

Compatible with: BMW 335i N54 (E90 / E92 / E93)

NMK's senior tuner

B58 Closed Deck Cylinder Head Mod 13641363918 Engineered to handle the stress5150 AutoSport B58 Closed Deck Cylinder Head Modification Service High horsepower B58 engines are known to experience cylinder head sealing issues due to the coolant jacket design around the combustion chamber. Under extreme cylinder pressure, the factory head flexes and pushes compression into the cooling system, leading to: Cooling system over pressurization Coolant loss Head lift Head gasket failure Unsafe coolant discharge under racing conditions