Thanks! I have heard that the winder is alot better balanced then the Viper. Looking forward to next winter :-DI went from a '16 MTX LE 153 to an '18 MTX LE 153, both similarly built, both great sleds, but after riding my '18 I don't know if I'd go back. They handle similarly, however the d&r chaincase is a significant difference, and the power doesn't hit as hard as my Viper did. The SW pulls harder in my opinion, and is put together much better.
I haven't done a tune (yet), just an exhaust and some other goodies to drop some weight.