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 : afe46-33010 Description : Silver Bullet Throttle Body Spacer 2011 Ford F-150 FX2 V6.3496cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 FX2 V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 FX4 V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 King Ranch V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 Lariat V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 Platinum V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 STX V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 XL V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford F-150 XLT V8.4951cc Air Intake Systems::Throttle Body Spacers 2012-2013 Ford Mustang Boss 302 V8.4951cc Air Intake Systems::Throttle Body Spacers 2011-2014 Ford Mustang GT V8.4951cc Air Intake Systems::Throttle Body Spacers