For those 6 speeders....do you notice that it sounds like there is something rattling in the engine (metal rattling sound) between about 4K-6K rpm? This has been bugging me for a while, but didn't think too much about it. Sounds like maybe there is some debris or something moving around with the sound of the engine.

 

Um, no dude, that shouldn't be happening.

Maybe you're detonating. If you always go to the same gas station, go to a different one (and of course, fill up with premium). Might be bad gas.

 

I hear VTEC, but nothing like metal rattling. Get it checked out and report back.