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  1. Dual Exhaust

    Commander Performance Modifications
    Hey guys, I just wanted to get everyone's opinion on whether or not dual exhaust will add extra HP. I added Big Gun Evo U Dual Exhaust Full System with a Dyno Jet Power Commander Tuner and K&N Filter. Big Gun's Website just says "Massive HP and Torque Gains" while other companies such as HMF...