Louisiana Purchase Kids Britannica Kids Homework Help aFe Silver Bullet Throttle Body Spacers TBS Ford F 150 97 10 V8 4.6 97 03 V8 5.4L. 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. Installation Instructions Installation Instructions Precision Machined From T 6061 Billet Aluminum Produces Increased HP Torque Throttle Response Increased Air Volume For Better Performance 2 Year Limited Warranty Special Helix Design No Annoying Whistle Fits w aFe Intakes This Part Fits: Year Make Model Submodel 2003 2005 Ford Excursion Eddie Bauer 2000 2005 Ford Excursion Limited 2004 2005 Ford Excursion XLS 2000 2005 Ford Excursion XLT 1997 2006 Ford Expedition Eddie Bauer 2006 Ford Expedition King Ranch 2005 2006 Ford Expedition Limited 2004 Ford Expedition NBX 2004 2006 Ford Expedition XLS 1997 2006 Ford Expedition XLT 2004,2006 Ford Expedition XLT Sport 1997 2000 Ford F 150 Base 2008,2010 Ford F 150 FX2 2000 2003 Ford F 150 Harley Davidson Edition 2001 2003 Ford F 150 King Ranch 1997 2003 Ford F 150 Lariat 1999 2003 Ford F 150 Lightning 2004 2010 Ford F 150 STX 2008 Ford F 150 THE 60TH ANNIVERSARY EDITION 1997 2010 Ford F 150 XL 1997 2010 Ford F 150 XLT 2004 Ford F 150 Heritage XL 2004 Ford F 150 Heritage XLT 2004 Ford F 250 Super Duty King Ranch 1999 2004 Ford F 250 Super Duty Lariat 1999 2004 Ford F 250 Super Duty XL 1999 2004 Ford F 250 Super Duty XLT 2003 2004 Ford F 350 Super Duty King Ranch 1999 2004 Ford F 350 Super Duty Lariat 1999 2004 Ford F 350 Super Duty XL 1999 2004 Ford F 350 Super Duty XLT 2006 2008 Lincoln Mark LT Base 1998 2001 Lincoln Navigator Base