What am I missing?

[Sportsterdanne]

Why grind off the chaincase ?? Use the Nytro parts.

I'd say buy a new viper, lots of room for a turbo. Any Cat skid can be bolted in (such if you're planning on making a mountain sled) and then go from there. Only weak link I see is the chaincase.

would not be in the same league the nypex is a great combo that yammi should have built but has not,with the right motor work & turbo kit they are plain nasty.
you can build them with a stock nytro mtx chassi have to grind off chaincase you use the apex one,from there its allot of little time consuming stuff.

you are not to far from cr racing they have done 3-4 of them you could call them for a price but it wont be cheap,they may be able to supply parts though if you want to do yourself.
there is a bunch of info on them in the snowest turbo yammi section.

 

[couch]

Check out the Revelstoke boys run a business putting an Apex engine in a custom cromoly frame with the Polaris ergos.

Nypro I believe .... only wish that mother Yamaha corp had come out with something along that line....