I did these on cobra swept exhaust, first I removed the baffles and it sounded pretty good. Maybe a bit harsh... but I lost quite a bit of power down low. I modded the cobra baffles and got a little bit more sound without any noticable power loss and I was happy for awhile. Just the other day I decided to do a little research into lollipop baffles and saw how similar they are to the BCT baffles. I have all the know how, hardware, and tools so I made some in about 5 minutes. Used the factory mounting holes. Took it for a ride and wow what a sound, a lot cleaner than straight pipes and almost as loud. I think I've got almost the right amount of back pressure cause the power feels just as linear as it did with the original baffles. I'll probably still experiment with different sizes and styles because of how easy they are to make and install.