46 31008 aFe Silver Bullet TBS 01 05 325i Base 01 06 325Ci Base aFe 46 33016 Silver Bullet Throttle Body Spacer AFE Mustang Silver Bullet Throttle Body Spacers 46 33026N (24 26 aFe 46 33009 Silver Bullet Throttle Body Spacer AFE Mustang Silver Bullet Throttle Body Spacer 46 33006 (05 10 Mustang aFe Silver Bullet Throttle Body Spacers TBS Ford Explorer 12 15 V6 3.5L. 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. This Part Fits: Year Make Model Submodel 2001 2006 BMW 325Ci Base 2001 2005 BMW 325i Base 2001 2005 BMW 325xi Base