I just put a set on with the Excaliber end caps. I'm real happy with the quality, sound and perfomance. Being a "muffler junkie" I'm always looking for a set of good pipes, lol. I've gone through many over the years. V&H, Rush, Rinehart, Supertrapp to name a few.
As for as preformance #'s these would be the same as any muffler with a 2-1/4" louvered baffle such as Rinehart 4"ers. They have a similar "spiral" louvered baffle (and it's actually secured to the muffler body instead of just seating into the end cap like Rineharts, so they won't loosen up or vibrate causing them to "chirp") Plus, I'm using the same PCV map that I had for the rineharts and it runs just the same.

 

Hello,

PTS Baggerz is a dealer for RC Exhaust! Let us know if we can answer any questions.

Regards,

Perry Price
PTS Baggerz

http://www.rccomponents.com/rcxhaust.htm