aFe Silver Bullet Throttle Body Spacers TBS Jeep Wrangler (TJ YJ) 91-06 4.0L 1977-chevrolet-k10-suburban-scottsdale-esi4916634 The system is constructed using

The system is constructed using T-304 stainless steel and is backed by our Million Mile Warranty

4L G4FA Main Bearing Set -

The exhaust sound provides accoustic feedback of engine rpm to aid the driver in critical decisions such as gear selection or throttle input in rev-match shifting

This part number comes with 2 pre-filters

aFe Silver Bullet Throttle Body Spacers TBS Jeep Wrangler (TJ YJ) 91-06 4.0L 1977-chevrolet-k10-suburban-scottsdale-esi4916634 The system is constructed usingSilver 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.