I just picked up a '99 Mach Z with an M-10 (and lots of other things), and I was thinking of doing rail and tunnel extensions to take it to 136". Didn't they make a Mach Z LT in the CK3 chassis? I'd try to find the factory tunnel extension if I could. Anywho, I'd want to run a 136x1.25 track unstudded, preferrably a Ripsaw. I currently have a 1" Camo, studded, no clearance issues. I know there's issues with a studded 1.25, but what about unstudded?