My regal has cheapo thrush turbo mufflers and they sound great if you ask me, but my car is cammed, and not a single part of the exhaust is stock, headers 3" DP, 3" race cat, 3"x30" glasspack for resonator, then Y piped to dual 2.5in/out mufflers, C6 Corvette tips. They only cost $23 dollars each...Loud is not always good, especially with these 3800 motors. I have heard some reallllly ****ty sounding exhausts.