I had a 2005 SRT-4 with a custom Turbo kit and a bunch of other stuff. It dyno'd at 471hp to the wheels in 100 octane mode @24lbs of boost and around 350 in street trim @19lbs of boost.I tried a set of diesel Walker Quiet-Flow mufflers on the tahoe, and they are far from quiet. Added extra resonator and additional high flow muffler per side just to get sound where can talk inside while driving. But it is NA motor. On a twin turbo v6 I tried to rely a bit on turbos to reduce noise and went with just a high flow borla and it turned out louder than what I was looking for. Eventually I will get it right, hoping Burban will be it.
I had a 3" downpipe to an electronic cutout that dumped right behind the front tire and the rest of the exhaust went to a 3.5" high flow cat, a 4" x 24" resonator like this https://www.summitracing.com/parts/dep-400405, and then to a flowmaster delta 50 that was single in and dual out. With the cutout shut, it was quieter than the stock exhaust and still had plenty of flow to keep the EGT's from getting too high and had let the turbo spool up quick. I daily drove it all over the place like that and it was crazy quiet inside. With the cutout open it was an absolute monster.