have rode impulse, alpine, mcx, and powderlites. Impulse and alpine respond the best, impulse's new stand alone fuel system sounds real cool. A true turn key and ride, you dont set anything or make any maps, just like a car it sets itself.
I have had a few of vanambergs tunnels years ago and loved them. Havent tried one of his new tunnels, almost did but I went with cr. Seen a guy with a vanamberg on a brand new apex (straypussy on SW) and he bent it haulin his 5 gal can up the trail on the way to the chalet. He mounted the can...
the firts pic is of my nitro as it has been all year the second two are of it ready for the big dawg complete with a new 174 track and CR 10 suspension, also new injectors thanks to paul at impulse. Wow do they work great.
rknight if you are going with a rear mount turbo and you ride in deep snow you will want to get the intake that the guys with the mcx kits run. Its kind of a 90deg elbow with a aluminum filter complete with a cover. From what I have seen that is the biggest issue they seem to have.