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    intake/exhaust for my 04 cummins

    Its time to update my rig, well not update but add on to. I have an 04 cummins and want put an air intake and exhaust on it. Looking for suggestions here. I tow a 3 horse GN trailer and want to increase my HP, torque and MPG, my MPG suck bad right now. Anyway, what do ya'll think I should...
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