It all depends on what kind of riding you do, and also how much you plan on modding the shee????
If you want a good "all around" pipe...I'd say pro circuit all the way.
If your looking at modding the shee..like porting, 4mil, ect....I'd run shearers or even CPI's.
T6's are good on a stock port, but you'll want to sell them if you ever plan on porting you shee.