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aFe Silver Bullet Throttle Body Spacer TBS 17-19 Nissan Patrol (Y61) I6-4.8L Dodge/Jeep Keychains 3-1/2" Round MuffleraFe Silver Bullet Throttle Body Spacer TBS 17 19 Nissan Patrol (Y61) I6 4. 8L 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