With a t3t4 you might want to consider running low boost, that turbo is pretty big for the D. I'm running a t3 on mine and it's a little "laggy", but it gets on it once I hit full boost. I had 10 psi runnin the hack, but now I'm runnin 10-11 with uberdata, daily driven. Of course I don't beat the hell outta the car unless I get picked on... If you run the hack you might want to consider getting that msd boost timing thing, cuz runnin the hack your timing is going to be advanced(not good with boost). I am running uberdata and it works fine, but my gas mileage sucks haha. I will convert back to the hack during emissions time though. Oh yeah, don't go the fmu route...