The 1000-2000 rpm drone with the Flowmaster 40 on the 3.5L was a killer. Luckily I know a guy with an exhaust shop that wanted to experiment with magnums. FM 40 was great sounding but a droner. The FM 50 was a lil bit better. But I went with the Dynomax Ultra Flow. The Dynomax has a nice growl on it when I step on it. When I get my laptop back from repair, I'll post the sound bytes side by side.