Ive never heard the ultraflows, but the bullets sound good. I also dont have the cats anymore and my muffler is underneath my car vs. being in the rear in stock location. This really brought the sound out!

 

i have had dyno maxes on both of my cars, and they sound great on both..

my first car, an el camino that was pushing out well over 400hp had 2.5" dynomax mufflers and sounded sick... the car could be heard from litterally 5-8 blocks away.. i used to get off the interstate, and my friend would stand outside his house, because he heard me coming... everyone always looked at that car with awe.. sadly some one liked it more than me and took it for themselves...

and i also have them on my Grand National.. and they sound evil on my wittle six banger....

-neil