I got it on last night (the HMF) and just went around the block a couple times. It's really loud, but cool sounding. The problem I had is I noticed a high pitched sound like a 2-stroke when de-accelerating. I think there might be an air leak between the stock header and HMF muffler, I'll have to take a closer look today. I'm at 4600ft so I think the stock jetting may actually be too rich still. I'll be experimenting this week to figure out what jetting I want. If anybody wants to report thier jetting at elevation, that may be helpfull to me.

Thanks