ok, so im on the same page as you. when u talk cooler u are not talking about cooling tubes running through the tunnel?
i first put 1.5" ripsaw paddle track on it. had to notch ever paddle so the cooling tubes would fit.(pics below)
this is the track after it was notched. 2nd pic is of the cooling tubes that i had to notch
now if you are talking about the front cooler where you would have to cut every paddle all the way across .5" down then that is alot of work. as i see it u have 3 options
1) sell the track you have now and buy a 1.5"
2) cut every paddle down, but ruin a good track at the same time
3) pull the drive shaft out and replace the drivers with the next smaller (you can do this yourself if you have a press to use and press the old ones off, if u do this u might as well replace the bearings on the drive shaft too so that wont fail on you when you get it all back together. (can get drivers reasonable from the link below)
http://www.firstplaceparts.com/pc/S31-28...index.html
hope that helps
xc_rider08