Duane talked me into staying with the stock Compression Ratio, rather than lowering it a couple points. Glad I did, has great bottom end power and no signs of hitting the DET light yet.
The only other turbo's I seem to run into are Axy's running Silber kits. They are running more boost and Avgas/Race fuel so it not a fair comparison. I don't miss having to run race fuel at all. I would like to run into a new Doo 850 turbo stocker to see how mine compares.
I ran the RKT mod 850 do head on my MPI turbo ski doo. Seemed to work very well. I ride at 9,000 to 10,000 feet and had to add some octane to pump gas before the head mod, ran straight pump gas after head mod with no det problems. I think the PF might be a little better since they completely reshape the dome