I am going to be sending my motor out to be built by either Redline or FAST in the next month or two and and I believe I am in need of new exhaust. 99% of the riding I will be doing will be trails (no sand around here). I am currently running the beat up SST's that came with the bike. My first choice was T5's, but everyone seems to recommend Shearers, CPI's, Snipers, etc. I was under the impression that these were all drag pipes. I've never ridden a 4 mil before so I don't know if that matters or not. Also, I do plan on getting the new cylinders ported by whichever builder I decide to go with. Any help would be greatly appreciated.