I just fitted an AEM CAI. I think I can feel the gains, which are proven anyway. But the noise is what is most impressive, at low revs I suppose it is much like standard, 3k to VTEC is a rumbly growl, but from the crossover to rev limiter is just immense!! You will not regret fitting one, keep your eyes peeled for a second hand one and you could save a load too. You will see a lot written on the forum about hydrolock, however if you keep in mind that the filter would have to be immersed for this to happen and that would mean driving through water of nearly a foot deep, the benifits really do outweigh the risks!