I have a V6 Firebird, with stock exhaust, when i reve my engine up, i hear the motor speed up, then i hear it get to my exhuast, almost like something, is pausing it, like restricking flow or something, what is it, the cat is original i think. thanks.

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191(3.1)V6 1992 Pontiac Firebird,K&N drop in filter, bosch patinum spark plugs, Pioneer reciver, kenwood 4x6's, sony xplod 6x9's, two kenwood tornado 12's with a 300 watt jenson running them, check it out at www.geocities.com/my_92firebird