I know Dan did on beta files, which I believe fixed now. I know of 1 in Aust too. Trouble is many don't bother to have dyno done at each stage and very few are on stage 2 at this point of time.
There is only minimal gains in peak numbers stage 2 over stage 1. If you're just chasing number against cost just do stage 1, panel filter and modify stock intake. That's clearly best bang for buck.
Stage 2 with intake and eith DP or full exhaust will get you gains across the board, better response as turbo spool earlier so high torque from just over 2000rpm compared to say 2600 on stage 1. You will also get nice induction sound from intake and better, deeper and louder exhaust note.
If you're happy with stage 1 and not interested in spending lots more, don;t do it. If you have come from having stage 2/3 cars in past and want more of that again you will go that way.
There must be decent gains with recent 1/4 mile times of stage 2 down to 11.5 and most stage 1 11.9-12.1. Thats significant difference.