I bought TOR's and installed and the dealer tuned for them. I was the same and wanted a little more sound. So I gutted my stock mufflers and put them back on, it can be done without blueing the outside, I used a two inch hole saw and the victor smoke wrench. It does sound different, a little louder, I'm not sure about better, its more like those drifter wanna-be cars the kids are sporting around town now. I kept a long thin yellow flame and slowly melted the baffles loose, then with gloves on, turned it up and shook molten junk out. It ain't a rumble, just louder. It also kinda has a wave effect at highway speeds, up-down-up-down. Also you could consider keeping water flowing over the outside while torching the inside. And after removing the baffles there is a converter looking thing in the front of them, I couldn't get that out. As for back pressure and all that kind of stuff, hmm beats me, although it is important. I'm probably gonna reinstall the TOR's when I go darkside by the end of the month.