the tunnel is carbon fiber, I put the fully ported carls cycle motor together with a crank with the same big bearing that is on the newer 800's like the dragon. I ran the sled in the grass drags, and took 3rd place but the 2 sleds that beat me took it way more serious then I did. look on my Craigslist ad for pics and more info. this thing runs really good. asking $3750 obohttp://seattle.craigslist.org/tac/rvs/3310159270.html
