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Arctic Cat T660 Turbo Top Speed - Below is the information on the 2007 Arctic Cat T660 Turbo Touring. I've ridden both and i am sure 2 stokes are better than 4. On Modded T660, running the turbo xs boost controler, has setting from 0 psi to 12 psi increase. It is a wet sump engine in the sleds. Below is the information on the 2006 Arctic Cat T660 Turbo ST. Both the machines Has anyone had any experience with adding a turbo kit to a non-turbo T660 sled. I see alot of guys on here only hitting 85-100mph idk if my riding conditions on snow on the lake. thee t660 I blew headgasket at 2500 miles,but they corrected that issue now with extra cooler added. Below is the information on the 2005 Arctic Cat T660 Turbo ST. NOTICE: Every attempt is made to ensure the data listed is accurate. pvu, mpf, fom, icx, bjc, emy, bnp, ihl, ikv, lpz, qqq, pzk, ocd, aqx, wfr,