I would be suprised if you dyno'd more than a 4hp increase with the cat-back, that is with the intake. putting a muffler on will increase power by decreasing back pressure. you should listen to my car and tell me that my car sounds loud and nasty, all i've done is change the muffler for that side of the car. for what you are trying to accomplish I believe the kit and muffler idea is the best. I can understand the painting issue though. But it will probably be closer to the end result you are looking for.
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