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I put Kooks 1-7/8 with green cats on and a tune. After that everything is stock (Stock NPP). Got a nice HP gain, a little deeper sound, and a bit louder at start up. Not excessively louder and no drone. I can still curse nice and quite. I would recommend E85 conversion if you have it in your area. Nice HP gain for a bolt on. Good luck with your decision. Happy Motoring!
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2SS Convertible, MRC, NPP, A8, Garnet Red, Blk Bowties
GM CAI, Ported TB, Kooks Headers, E85
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