Okay, today I installed FORSA 12.25" shocks on my SCR950. Stock shocks are 10.25", so that's a 2 inch rise. These shocks are made for a Sportster. First of all, while they do fit with some modification, they are too long. With a stock exhaust system, the bracket on the swingarm that keeps the rear brake hose out of the tire will contact the OEM muffler bracket. I removed the front-most bolt and swung the bracket ever so slightly out of the way, and this allowed me to fit the shocks. I can notch this bracket and still attach the front bolt... but the shocks are still too long. There is a LOT of slack in the drive belt now.
That said, I took the bike for a quick ride, and WOW what a difference. I didn't bottom out going over speed bumps, even with the FORSA shocks set on the lowest preload setting. The ride felt about the same - rather firm - but there is SO much more ground clearance in turns. Handling is now on the quicker side of neutral, instead of the slow side. I can still ride hands-free without any kind of wobble or instability.
I like the stance of the bike a lot better as well, the bike is canted more forward and it looks more aggressive, and there is more space between the rear tire and the fender.
That said, I'm going to use these on another project, and go with 11.75" Sportster shocks instead. If the shocks were a half inch shorter, the swingarm will not contact that bracket, and the slack in the drive belt will be a little more manageable. So I'd say that 11.75" shocks are the maximum you can use with the stock exhaust system. 12.25 is probably the maximum you can use if you want all the ride height you can possibly get, AND are okay with more slack in the belt, AND you have an aftermarket exhaust. That's a lot of conditions.
Also, the bike really needs a 2x4 under the sidestand now.