[tks]

Im thinking of putting stacks on my truck, right now I have the ats upgrade ,3" down pipe and 4" straight out, no muffler.Sounds good. My truck is a 94 3/4 ton 4x4 ext cab. How loud will it be in the cab with stacks? Tim

 

[Mr_Roboto]

When I removed the stacks from my rollback it easily cut the noise level in half. The acted as amplifiers.

I didn't make any other changes, just cut off the exhaust pipes directly behind the cab. If I knew how much quieter it would be I would have done it when I bought the truck.