Problem is, any exhaust system for the new trucks is a complete waste of money, you gain NOTHING. No sound, no power, no mileage, nothing.
These trucks have what amounts to a cork up their tailpipe, the ONLY way you will see any gains is by doing a DPF delete. And those are illegal and have been basically put to bed by the EPA.
No DPF-back exhaust is worth the money it costs, might as well flush your cash down the toilet, it would be mildly more entertaining.
'07 3500 SRW QC/LB-EFILive w/Silverbullet Tuning-Goerend-Hamilton-Project Blue Balls
'03 2500 QC/LB. HO/NV-6.7 swap-HE351v-Southbend-TNT/R