Mods for performance? I'd say oil pressure and boost gauges, as well as dsmlink.. first thing. With all the options. That will give you a great starting point, as well as boost control and logging/diagnostic of anything/everything in the event something isn't going quite right. Then you can do exhaust, intake(pre turbo), fuel pump, injectors, FMIC, turbo, cams. I don't know about anybody else, but I'd pretty much do it in that order, if it were me doing it all over again.