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Negligible gains from a cat-back only. As you start adding other mods like forced-induction, or more cubes, then a 3" system may flow better.
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Forgeline GA3's 9.5/11 with NT-05 Nitto's, Pedders Sportsryder Supercar Coilovers, MGW Shifter, LPE GT1-1 Cam, AR 1 7/8" LT's, Halltech CAI, SW Retro Chambered Cat-Back, Installed and tuned by Corey @ Henderson Performance Technology.
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