lots of companies make strokers for various engines. I understand tomei, hks, jun and other companies make strokers for RB20-26 engines, 1-2jz engines and various other ones. Biggest difference alot of people have noticed is that the engine has more torque. I'm really not sure wether this is the case but it does make sense with the slight increase in displacement. I'm sure there would have been people on the forums with a stroked engine.