for what its worth,i have sst's and my nephew has t-5's on our identical prepped shee's.racing up the hills at the dunes neither of us can pull the other.one of us may pull a half a bike at the start then its all the same.i dont know why some one would think that if you mod you bike w/ sst's it wouldnt run correctly but maybe.maybe its too what level,porting shoudnt hurt.