The sled was bought from Speedwerx as one of their packages. So they did the install of the supercharger. It does not look like it would be real difficult to install if you have installed a turbo before. In my opinion I think it would be easier to install than a turbo.
I have played around a lot with the clutching and gearing.
Gearing: I have tried a 25, 26, 27 and 28 tooth top sprocket for the TKI belt drive and I have definitely settled on the 28 tooth top gear for the belt drive. I do know of one guy that is running a 153" and he is running a 30 tooth top sprocket and he "really" likes it. From what I have heard from most of the other guys they are running a 27 tooth top sprocket.
Secondary: Speedwerx recommends the stock 48 degree helix and the stock Cat secondary spring or a secondary spring that is a little lighter. In my mind I didn't think that this would be a very good combination so I ordered a spring and some different helixes. The spring that I settled on is a 190/260. The stock spring is a 180/240. I tried a 43, 44, 46, 46/42 and the 48 degree helixes. To keep this short I am running the 48 degree helix in my sled. On certain days depending on the snow conditions and where I am riding I might switch to a different helix.
Primary: Speedwerx recommends the stock primary spring 85/255. I am running a 120/280 primary spring with as many as 3 Glide washers. With the stock primary spring the engagement is low and very smooth. I am running 72 gram clutch weight and my rpms are 8350. I am going to add another gram of weight and bring the rpms down a little bit. The recommended rpm range for this sled is 8100-8300. Speedwerx recommends 74.5 gram weights with their setup. I think most of the other guys are running 72.5 gram weights.
Almost all of my riding is 9000 foot and above. I have played with the boost by changing out the top pulley to a smaller one and the results above 9000 foot are pretty impressive. If I ride below 9000 foot I put the stock pulley for the supercharger on it and don't change any of the clutching. If I am riding above 9000 foot I change the top pulley to the smaller one and install the correct map for it, that all. You could leave it alone and just run the larger pulley for the supercharger all the time and you wont be disappointed in the performance up to about 11000 foot also.