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The Silver Bullet throttle body spacer is constructed from precision machined 6061-T6 billet aluminum and is designed using a serrated/helix design...

Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque a...

Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque a...

Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque a...

Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque a...

This 7” tall 360-degree radial flow air filter features a 4” round flange and our oiled Pro 5R media with five layers of progressively finer co...

This 7” tall 360-degree radial flow air filter features a 4” round flange and our oil-free Pro DRY S media with three layers of synthetic media...

Large Five Layer Performance Air Filters: These 6" tall 360-degree radial flow air filters feature our pre-oiled Pro 5R media with five layers of p...

Upgrade your Z4 M Coupe exhaust with the Twisted Steel 2 ½" race pipe. Mandrel bent from 304 stainless steel tubing for maximum exhaust flow and c...

Advanced Flow Engineering, Inc. (aFe) produces high flow, high performance air filters & intake systems for the automotive industry. Founded in...

Long Tube Headers: Formed Collectors: 3-to-1 mitered collectors decrease turbulence and increases exhaust velocity. The result is increased horsepo...