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. 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. PartNumber : afe46-33002 Description : Silver Bullet Throttle Body Spacer 2007-2008 Ford F-150 FX2 V8.-cc Air Intake Systems::Throttle Body Spacers 2010 Ford F-150 FX2 V8.-cc Air Intake Systems::Throttle Body Spacers 2004-2010 Ford F-150 FX4 V8.-cc Air Intake Systems::Throttle Body Spacers 2006-2008 Ford F-150 Harley-Davidson Edition V8.-cc Air Intake Systems::Throttle Body Spacers 2010 Ford F-150 Harley-Davidson Edition V8.-cc Air Intake Systems::Throttle Body Spacers 2005-2010 Ford F-150 King Ranch V8.-cc Air Intake Systems::Throttle Body Spacers 2004-2010 Ford F-150 Lariat V8.-cc Air Intake Systems::Throttle Body Spacers 2008 Ford F-150 Limited V8.-cc Air Intake Systems::Throttle Body Spacers 2009-2010 Ford F-150 Platinum V8.-cc Air Intake Systems::Throttle Body Spacers 2008 Ford F-150 THE 60TH ANNIVERSARY EDITION V8.-cc Air Intake Systems::Throttle Body Spacers 2004-2010 Ford F-150 XL V8.-cc Air Intake Systems::Throttle Body Spacers 2004-2010 Ford F-150 XLT V8.-cc Air Intake Systems::Throttle Body Spacers 2004 Ford F-150 Heritage XL V8.-cc Air Intake Systems::Throttle Body Spacers 2004 Ford F-150 Heritage XLT V8.-cc Air Intake Systems::Throttle Body Spacers