[Ivan D.]

where your exhaust exits has a lot to do with what you'll hear in the cab - having it dump under the bed and before the rear axle makes for lots of in-cab noise, the sound waves bounce all over between the axle, the road surface, and the bed. Having exits somewhere outside the truck, such as all the way back under the bumper, will help a lot with drone - first thing I notices after I put my stacks on was how quieter the cab is, even with the exits being right about a foot above my head tis still not even close to the loudness I had before with the short exhaust.