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.
Price: $85.00 Pros: This crazy design is NOT like the spacers that merely twist the air because mine does NOT whistle. [09 JK] Cons: Pricey for what it is.
Need upgraded air intake to notice much difference. Recommended? Yes
Comments: Notable difference when Iadded a K/N filter and E3 plugs.This crazy design is NOT like the spacers that merely twist the air because mine does NOT whistle, but like i said; it suck lots of air. even better now with an exhaust upgrade.
Price: $79.00 Pros: None Cons: No noticeable performance improvement, whistles Recommended? No
Comments: First of all, mine is the JK version 46-35002. Nothing specifically bad about aFe, just TBI spacers in general make no noticeable improvement to the JK engine. But if you like that ricer whistle, this is the upgrade for you.