http://www.grandprixforums.net/porti...ger-26003.html this was the only one i found. What i did was use a carbide tbit and a router. I used wd40 to cool the bit which stopped it from plugging up and seemed to help it take out the aluminum. I removed the bolt bosses and just extended the v down to end of the case. I also did some work on the inlet with opening it up and smoothing out the divot.