When I was still shopping I asked Tom how much of a gain the full was vs. the can only. I bought it back in Sept and he hadn't had it dyno'd but guestimated a horse more. I was also told it wouldnt likely make a huge difference. I figured I could put that extra $200 to my suspension which to me is more criticle for my riding.
I figure for the average person any pipe will be an improvement due to the fact the stocker weighs a ton and well...its just plain nasty looking.
At the time the only things avail was the GYT alum,the HMF and the TC. 5mo later I still dont feel the immediate need for the header regardless of what the actual hp gains are, but I was never a firm believer that a pipe will make or break a win on a mx track anyways.
and yes I love how it performs. I have never felt a pipe was worth every penny as much as this one. My next choice would be the Thunder Alley.