PERFORMANCE CARB SPACER KITS Better fuel economy-tests prove a 10% increase in miles-per-gallon over stock! Dramatic improvement in mid-range power and torque! Easy to install in less than 30 minutes-no drilling or cutting required You'll feel the difference! The 6061-T6 billet aluminum spacer features a dyno proven Helix Bore that forces incoming air to spin as it pass through the carburetor. This beneficial air charge carries all the way into the combustion chamber, producing a super atomized mixture that results in huger power gains and improved fuel efficiency. Brackets, gaskets, hardware and instructions included.