The problem is 8 tooth drivers create more friction simply trying to bend the track tighter around the drivers, it is harder to bend the track in a tighter radius, this creates friction. If you ask me the traction gained compared to the loss of drive efficency doesnt work out in your favor, youd be better off running a 1 inch lug with studs in middle belt only and be able to run it looser and gain more, the 1.25 will eat up your speed along with 8 tooth drivers. The other problem is the gearing, your going to need to run a mtn max speedo drive box or your speedo will be out in left field and then buy all new gears to try and get back to stock ratio's. if your going to do just snow drags, then run a bigger lug track like a 1.5 with no studs, but stick with the 9 tooth drivers, you can fit all the way up to a 1.75" lug in a srx with 9 tooth drivers, you do need to remove the pick protectors and tunel strips but with no studs, they are just along for the ride anyways.