My BIL (aka Capt. Stoopid) has it on his '94 DS and it works well. We were in the woods last weekend and it did real well blazing a new trail up and down a good sized ridge. There was 700 pounds of men onboarb and the belt never squeeled or slipped. It's good fun when the undergrowth hasn't come in yet. In a month, that area will be impassable.
I am sorry but I have to say this. That torque spring for the driven clutch is going to end up costing you in a few years. It may give you a little low end and mid range but it does not allow your drive clutch to close all the way making your belt not ride to the top. And you also loose about 2-3mph top end. After a year it will wear grooves in your drive clutch. You want more torque with out affecting your clutch faces? Get the drive clutch power spring.
Sorry, just had to put in my 2 cents.