dyno-max mufflers good / bad?

Locomotion said

They may be a little louder than what you're looking for, but I put a 3" TTI X-pipe and Dynomax UltraFlo mufflers on my race car and it picked up a little bit! I figure the X-pipe helped and the mufflers didn't hurt. I also get compliments on the sound at the race track. The "X, or an "H", may also help tone the sound down a bit.

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Funny you say that, I thought my car felt different when I put the TTI kit in with the super turbo mufflers. Seemed like it lost some pep. After a little bit of driving and not liking the Quiet sound I called dyno-max and swapped out the super turbo's for the ultra flow mufflers. Looks like I wasn't crazy, the car was much faster with the ultra flows. Car was definitely restricted with the super turbo's , now it has it's pep back ! And Everyone asks about the exhaust 'cause they love the sound !