When my friend had an AEM installed on his 2000 Celica GTS, it immediately sounded meaner. It just sounded really nice when you step on the gas. So because of that my friend and I decided to get an AEM CAI installed on our GSR's. Boy, were we disappointed. Almost zero difference in sound level. Only during high RPM's do you hear anything. I sure hope there is an hp increase because the butt dyno feels nothing.

Oh, once you get a header you start hearing the secondary runners very distinctly from VTEC. Now that sounds sweet, but not very deep from my 4-2-1.