I am looking for feed back on exhaust for 98.5 dodge cummins, As for now I've got 4 inch straight turbo back out behind the wheel, and was thinking of putting on 6 inch stacks will the exhaust be loudering in the cab Its a quadcab. I'm looking for opinions of what you run and how are the noise levels in your cab I will be towing a ball hitch camper alot Thanks