Respectfully, I disagree. I have done most all of the available mods. The C3 pulley will give you a much bigger kick in the seat than a CAI by itself. I had the LET CAI, too (currently running NeedsWIngs dual CAI, manis and LET 185 pulley). To be fair, though, you should do the C3 pulley with their intake mod at the same time. The low end power increase is remarkable. After that, when the $ is available, do an ECU tune. My 2 cents.