I am with you on the it doesn't make financial sense to upgrade to the XDS at this time and DIY turbo. I ride between 7000ft and 11,000ft altitude which can take 3-4 lbs of boost just to get back to sea level performance. Many guys here are putting small turbo's on their 4-stroke snowmobiles and not even changing anything else like ECU, fuel controller, injectors, ect. to get back to sea level performance that the machine is actually designed for. I think I might start another thread to discuss this further but ya, I am thinking along the same lines as you for sure. You can do a stretch and a turbo kit for 6-9k so why pay 12k difference for a stock machine you still have to mod. Not me, I'll take the extra 4K+ and use it for fuel.I have been trying to decide between these two myself. I like the aerocharger turbo,real air filter and intercooler . I like the plumbing (keeping dual mufflers),larger injectors,new pistons and the reflash of mxc. If i can find a dyno within a reasonable driving distance i may just make my own. After pricing a new xds. With trade in I would be looking at 12-13 thousand plus financing, and still have to mod it. so a turbo kit, and stretching the rear diff on my 13 seems the way to go.