Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque and improving throttle response and fuel efficiency - +6 hp, +3.5 lbs/ft torque. Silver Bullet throttle body spacers are constructed out of durable T-6061 billet aluminum and using a unique serrated/helix entry to create turbulence at the manifold while eliminating the annoying whistle found in other helix only throttle spacers. This throttle body spacer is 50-state legal (CARB E.O Number D-516-2).

Only for cars with N54 engine. Not for cars with N55 engine.

This throttle body spacer fits the following BMWs:
2008-2010 E82 BMW 135i
2010+ E82 BMW 1M Coupe
2006-2010 E90 BMW 335i 335xi 335i xDrive- Sedan
2007-2010 E92 BMW 335i 335is 335xi 335i xDrive - Coupe
2007-2010 E93 BMW 335i - Convertible
2004-2010 E60 BMW 535i 535xi 535i xDrive