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The stock exhaust will be fine although you will benefit more from a free flowing 3" exhaust. I have the kooks headers with MBRP 3" and it sounds great and def. makes more power. I have a slp loudmouth 1 that i'm going to sell if your interested.
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2010 CGM 2SS/6MT-Kooks LT headers w/cats, MBRP Exhaust, D1-SC Procharger, FAST 65lb Injectors, NGK TR-6 plugs, 160* T-stat, ADM Boost Gauge,ChuckTuned= 530rwhp/500rwtq
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