What are you talking about? Stage one is simple reflash, stage 2 requires intake, turbo back exhaust including downpipe, and 4 bar FPR if we are talking about your GTI. Stage 3 is BIG TURBO software which depending on brand- can be tuned to specific setups (atleast REVO can) so don’t quote that.
So in conclusion- you are STAGE 1 with A3 pipe and no intake or exhaust? I would say you are still probably in the high 14’s low 15’s range. What should a B5 S4 be capable of?