I recently bought a Delkevic slip on and I really like it.... not just for the money, it's of good quality and sounds great (baffle removed). I would like to improve the breathing more, but I don't want to mess with the factory header, or gut the cat. I would like to keep the factory pipe "factory" just incase they crack down on the emissions thing. The factory header is a pipe inside a pipe set up and is super restrictive. I have only found a couple of companies that make headers for the 1250 Bandit (please let me know if you know of others). One is Arrow, not the best looking IMO, and the other is Holeshot's...very nice, excellent finish, but pricey. I contacted Delkevic and they said that they had plans for one "on the back burner". I think they might speed up the availability if there were more of a demand. If anyone else is interested, fire them off an e-mail and tell them.... couldn't hurt.