U will gain almost unnoticeable sound change on a dpf back exhaust.
With my 4" down pipe back straight pipe it it not much louder than stock unless I get on it.
I would spend the money else wear, save up for tuner or efi live for when warranty is out.
2008 Chevy 2500HD LTZ CC/SB LMM
NorCalTruck Stage 5 Cognito Leveling Kit - Cognito UCA, Fox Resi Shocks, Rare Parts HD Tie Rods, Cognito HD Swaybar Endlinks and HD pitman and idler arms.
BMF M80 death metal wheels 17x9 Nitto TeraGrappler 285/70-17
EFI LIVE with locking dsp5 switch tuned by Kory Willis
Edge CTS Insight with pyrometer, MBRP SS Turbo Back 4" exhaust no muffler w/ 5" tip, EGR Block Plate
Transgo Jr, PCV Reroute, Resonator Plugged