T3's are pretty pipey, and they get really bad when you cut them, you end up with hardly any low end. Once you get into the power they're pretty good, they rev very high. I wouldn't waste your time on them, get some cpis or shearers, you will be much happier.
T3's don't fit perfectly on a-arm bikes, you have to put a small dent in the front of the pipe for the a-arm bolt.