Ya mountain magic sells the aero charger kits they are a dealer / distributer for them now I personally spent some seat time on two pro turbo's they built and wow they ran greatI heard that Mountain Magic has a pretty cool kit for the Pro RMK !
From the Turbo Pro's that I have ridden with, the Aero Chargers seem to work ok, as well as the Silber kits on a good day, ..they appear to give you your money's worth for what you are paying. However, IMO, the "Boost It" Polaris turbo kits are far more comprehensive. The Boost-It crew has spent a few years researching and developing a kit that is complete ..and with the best quality components. Quality Garrett turbo, 50mm Turbosmart BOV, water to air intercooler, aluminum exhaust donuts, electronic boost controller, guages, etc..., and of course the Boost-It Fuel Controller that is integrated with the boost control and the A/R wideband guage.
You may be laying out a bit more cash at time of purchase, ..but you won't be disappointed with the quality and performance, ..and you won't be wasting trips to the mountains trying to tune the bugs out of a "lesser" kit, ...let alone sitting back at your hotel room wishing your bargain kit hadn't let you down, (....while your buddies are out riding).
Cheers