I reglarly do 7.1 - 7.2 with CAI, before it was 7.4 15.2 is 0-400 time. Measured on the circuit, and backed by G-tech results. You loose torque, because you dont keep up to the length and volume of the original intake, you dont gain hp b/c it is restrtrictive. Search the web. I did it once, and posted on toyotaowners club "how to make good intake" Use search. There's tons of info from last year concerning intakes, power gains (with dyno) and times.