I know some deisal exhaust systems will work on gas trucks. Might be going to a L92 based 427 10- 10.5 compression plus boost so the need to open the exhaust up will be needed.

Looking for a straight through design that is the quietest possible.

The truck is a 05 serria denali crew cab

I can fabricate the exhaust if needed if there was a muffler only, but a close fit would be better.

Im running a 3" magnaflow exhaust now single out

 

I was using the Corsa 4" cat back for diesel's and loved it...This was on a SSS radix'd 370ci...Just buy the right cab configuration and you should be good. I bought a Flowmaster dual 3" to single 4" Y pipe and some mandrel 3" bends and did all v-band connections...worked out very well..

 

my friend had a single 4" on his procharged 370.. it worked really well no restriction really.

i have a mid-pipe from a d-max cat-back, 4" v-band, dynomax bullet, and dump if you are interested.

 

I have some mandrel bent 4" tailpipes for sale