I'm in your boat. For my race car it's race bullets, louder the better. For my crusier, my vert, I wanted something very quiet, so I tried magnaflow. HATED IT! Sounded like a 69 roadrunner with glass packs. blattablattalbatta. Couldn't wait to get it off the car. So I sold it to a guy with a turbo 5.0 because hellion recommended that cat back, so he puts it on, and calls me up complaining he couldn't hear it run. wow. Just my luck, his combo worked great with it. So I asked around and looked around and decided to give dynamax a try. 600 hp never sounded so good. It is quiet, but opens up a little when I get into it. At idle and part throttle very nice and subtle. I tried the stock mufflers and ended up blwoing my PCV valve out from the back pressure. I say try dynomax once and see how you like it. Much quieter than the log truck Slowmasters. aka dronemasters. Not a fan.