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The character of the two are differnt in how they make power.
The 800 turbos come on harder and have more bottom end... this can be good or bad.
They can both make similar power.
Curt at FTX is building a turbo Pro chassis as a project... I believe he elaborates more on this is his build up.
He is a big guy, with access to any parts he wants.. he chose the 700 to turbo as he says he as more ability to "finess" this sled in technical spots.
I'm NOT saying you cant do the same with an 800... Just something to think about.
The 700 turbos seem to get a bit better fuel economy.
Why dont you break down for us what you expect from the sled.
What Length/type track?
What altitude?
What location/snow-type?
What other mods have been done to the sled (ie suspension etc)
Ridier size?
Boodocking, hill drags, or climbing as a primary purpose of your fun?
What is your budget and ability to run race gas/mix?
Lots of variables... one size definately does not fit all.
The more info you provide the more refined your answers will be.