Can I ask which kit you had installed? The Polaris kit?Had mine installed yesterday. i have to say i LOVE IT......i was at 4800 rpm at 25 mph, very comfortable as far as noise goes. I only ran it up and back to about 40 mph and i really didnt notice any difference in the power delivery. It allows you to actually use low gear again, which seems to be just as good as before, now this was just on average dirt roads, few climbs to check low speed. What everyone needs to keep in mind is these are not designed to be a replacement for a sport model (pro xp, etc). so you need to manage your expectations on power delivery. If your on the fence about getting it installed don't be, you wont regret it.