Anyone notice the supercharger like sound when you're revving really hard? It's hard to explain. You know those Nissan commercials a few months back where the Altimas are going really fast and blows by you? It made a really distinctive "ssssssssssssssss" sound. Sounds electric almost but not a "rrrrrrrrrrrrrrr" type sound. Ughhh, I'm making it worse.

Just try it. Punch down the accelerator really hard and listen carefully. But anyways, what causes that particular sound? Vaccuum? Pressure?

 

Don't know what causes it but know what you are talking about.

 

i know what your talking about.. sounds niceeee.. not loud enough but it does sound nice... i never have my music turned down so i rarely ever hear it..

 

I could be wrong but it should have something to do with the direct injection.

 

Maybe the engine ready to blow up??