So I'm sure someone out there has done this. I want to put the cmx track on my 2015 ts st. Can I simply change the rear control arm to the latest scissor arm, so it will make enough room for the 2 1/2" track? Or is there more to it than that?
The scissor arm has nothing to do with it. The issue with the 2015 TS is there isn't enough clearance for the chain. This is why the 2 1/2" tracks were notched. You will also need to get the drop bracket kit from TS or make something up. Unfortunately 2015 is the worst year to do upgrades to.