- Due to the specialized tools needed

2020-Present     G02     X4 M40i

G01 X3 M40i

and improve overall engine efficiency

cast 310 stainless steel THV5S / 1

BMW / Toyota B58 Valves by Ferrea Options:30.1mm Intake / 28.5mm Exhaust - Due to the specializedFerrea Competition Plus Valves are trusted as one of the most dependable extreme duty valve kits available. Specifically designed for the B58 engine, which powers vehicles like the BMW 340i, 440i, M240i, Z4, Toyota Supra, and more, these high performance valves are built from aerospace grade alloys, including EV8 Z18, for superior tensile strength and durability. Ferrea's exclusive two step slow forging process optimizes grain flow, reducing material