Yeah don't worry about the bypass valve, I wish I han't, just look out for giant puddles of water. www.aempower.com has dyno results for most of their CAI systems for the 5th gen Prelude you get 5.4hp with the regular CAI and 7somethin'hp with the V2 intake and this is of course to the wheels. Personally I would go with the V2 if I didn't already have the first one. I'm pretty sure it only comes in one color though.