Re: Question regarding cat removal.
Hahahahaha. The big so called cat under these bikes is the MUFFLER! Like an automotive style, the slip on everybody refers too, is like an exhaust tip. The actual "cat" part is in the the two pipes in between the Muffler and the 4 main header pipes. Trust me, i have dissected my stock exhaust all apart to see what was going on. The cat is a honey comb, and it flows straight though. You can shine a flashlight in it and see right though it. But has a ton of surface area that stays crazy hot to burn any unburnt fuel that comes out of the combustion chamber, for emissions reasons. The big restriction is in the muffler, the big box under the bike. Take some time to cut shit apart and see whats going, so you better understand things. Im currently running an 05 header and Late model GYTR muffler. And yes it acts like a muffler. It has perforated core with packing. The stock slip on is straight though, basically no packing, and only a few perforations for tone, and the EX up valve. Like a valved exhaust tip. LOL! Yamaha has to meet strict epa standards for pollution and noise but still have good performance too. But we all like our bikes loud! Including me! Im sure ill hear all kinds of good comments back on this. HAhahahaha! Have fun with it.