has anyone personally done this? and what ecu setup did you use? stock exhaust? would a front mount intercooler make much more hp on the stock turbo than the top mount? or will top mount max it out as is?

What exactly are you looking to do? Swap out your ej20t for an ej22t?

Keeping everything stock.....the ej20t made quite a bit more power.

If you have money burning a hole in your pocket, just spend it on getting mods for the ej20t