Ok to start, several tracks that I have run at require mufflers and some have max db limits between 105 and 110 measure at track side (about 50 ft or so). That said i previously had dynomax bullets on 3 inch exhaust but was over the db limit (@121db). Car ran great with them as the are bassically just a wide open tube. So i had to make a change. Went to the 2 chamber race flowmaster to quiet down a little. well it did quiet the car down, which was great but i can easily say that they dont FLOW. Car slowed down around 3 tenths. Did some tuning to adjust to the drastically increased exhaust pressure and ended up right at 2 tenths. 2 tenths is crazy for a muffler change. Again, 3 inch, same location dumped right before the axle. Does anyone have any recomendations based on what you have. the car is going to be loud. I understand that. I just need to keep it reasonable and have a muffler. what do you all run on your race cars. any suggestions.