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OVERKILL 19
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A straight piped diesel Rollin coal will make anything you tow/anything behind you black. Stacks eliminate that. Also, shorter route for the exhaust to travel
Black smoke is really a sign of poor performance. You need a better tuner if your trailer is covered in soot! Pulled my white trailer to Armstrong and back two weeks of running on 550hp setting. Washed nothing but bugs off when I got home. If stacks are a performance mod on your truck, id say you must be in the 1500hp range cause 4" is good for 600hp anything bigger is just noise!