I bought the Fat Cat, we have several bike that come in and out of the shop that have Thunder headers on them. Like the sound but the dirty blow back drives me nuts.
Iput the Fat Cat on and dyno'd real quick before we start build just to see if there would be much differnce compared to my old true duals and Sampson Rolled Thunder Ovals. They had lots of back pressure, to much back pressure, gained 11+ horse and lost 4 lbs. I would expect that to recover after new motor gets broke in. The sound is much differnt, really loud and lots of decel cackel.