Had the Fatcat on my 95" FXDI, but it is just too loud climbing the Rockies all day, causing headaches. (hey, I'm in my mid 50's now, cut me a little slack). Decided to try the Rush mufflers w/stock headers since they have 3 interchangeable baffle sizes. Went with the 2" baffle. These are without a doubt the best sounding slip-ons I have ever heard. They are still loud, but the tone is much better than the 2-1,and a deep rumble that is truely Harley motor music. As for the power aspects, the Fatcat was 95 hp and 99 torque. For the Rush mufflers and stock headers on the same dyno, 88 hp and STILL 99 torque with an almost identicle torque curve. For those of you searching for slip-ons with that "deep Harley rumble", it's the Rush jobs. These puppies sound great with very good torque. Did I mention how good they sound?