Is Delkevic the only manufacture of a 4-1 system for our bikes?
I ask because I like the systems they make, they all sound amazing but I've yet to see one that's truly performance. I have access to a dyno and a genius tuner, and want to play.
I also found a company that makes stainless copies of Austin Racing GP1R and GP3 slip on mufflers. I wouldn't at all mind a 120mm muffler on the XJ, and neither would me neighbors since it would still be quieter than my old Buell... (it was basically a straight piped Harley.)
I do like that Delkevic's header comes with the midpipe that makes using any universal slip-on easy, and is exactly what I'm looking for., but I do wanna see what else is out there.