I'd disagree, i had a dune port from Kevin Herr, with the T-5's it was a perfect dune bike. With the shearer's it wasn't bad, just had to work a little bit more to keep it on the pipe, but more than just pipes come into that equation: tires, gearing, rider weight, etc.
What kinda porting you wantin Cole? I have a buddy that has some Trinity ported Cylinders for sale, pretty sure they're a drag port but he ran them with some FMF's and it was about even with my dune port and T-5's. He's sellin 'em fairly cheap too i think.