YES. and they have a very nice graph! We took my friends Raptor to Kenz and dynoed it with his Graydon and it made like 46hp and then went home installed the LTE's and their supplied jet kit and went back - the bike made an additional 4rwhp over the Graydon! And it's not like the Graydon is one of the lesser pipes out there, they make really good power for a single as do the Sparks and CT pipes.

Just my .02 for what it's worth.