You know, torque gets you off the line. Horespower keeps you there. Having high HP numbers looks great on paper, what looks even better is high torque numbers. There is no one thing that you can put on your engine that will give you instant gratification Well (nitrous) short lived but fun. The rest need combinations. A CAI needs exhaust, Spark plugs need wires ,distibutor,cap rotor,coil. Underdrive pulleys need belts. The moral . DON'T EXPECT ADDING A CAI BY ITSELF WILL NOT HAVE YOU RACING CORVETTS!! TAKE YOUR TIME! DO THINGS RIGHT! IT WILL COME.