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I have a 2001 civic ex, and i got a full ractive exhaust, and just recently i hear this slight rattle and vibration noise, its not very loud, but you hear it at idle and if you rev it up a little it goes away most the time, i dont know if it is just vibrating on something or its a exhaust leak, it seems to be coming from towards where the mid section and axle back exhaust meet i think. Does anyone have any ideas why or solutions? Thank you very much.

 
Rep Power: 313

sounds like you "B" pipe is hitting the bottom of your car.

Or your muffler is hitting your back bumper.