Well just got mine today, installed and omg I love it. Second best upgrade I've done yet, jack shaft is still the best. But I have a very noticeable increase in low end torque and a small increase in high end "2 mph". I only trimmed about a 1/2" from the assembly. Don't get me wrong I love the added performance, but I like sound even more. It's slightly louder then then an unmodified exhaust, but not too much. Sounds much more like a motorcycle now, instead of a lawn mower.
I did need to take my kick stand off, just wouldn't fit with the pipe, so I'll look into one that attaches to the rear of the bike.