I have the complete front/rear MPI suspension on my TRX-1 Mtn. It seems like a nice suspension(159"). I had to put the rail stiffeners on the billet rails because they were starting to bend a little.
I had one of the early complete rear suspensions from them and the front H-arm fell apart. They saw that there was a problem with their design so they changed it, but offered me NO warranty. Since I had the rest of their suspension, I had to buy the replacement. That lack of customer support caused me to stop buying their products. They also screwed me on their POS stainless ice scratchers.
If I were you, try another company's suspension. I still have a bitter taste in my mouth from them. Once they have your money, they really don't give a crap about you. My sled is basically all MPI-front/rear suspension, tunnel, turbo, etc..