Recieved my new DPP exhaust in 2 days! I installed it tonight, only an hour total. The pain in the butt is getting the old off. Anyway, the exhaust is an aluminized 4" with a 5" stailess tip. So far the sound at idle is close to a 24 valvle w/o muffler. Also no drone. No increase in sound in the cab either. I can't say enough good things about the DPP system. Thanks Mark, I will post pics when I can figure out how to make them smaller.