Intercooler, catless downpipe, stg3 OTS tune, then E-tune. Everything else is just a detail for a fraction of a HP. Intercooler is def #1 on the mod list after the AP3. The tune or downpipe or any of that other stuff should really start entering the thought process after words. Buy an intercooler that will fit your ultimate goal, then go from there. Buying the DP, catback, intake, etc etc etc is all very little gained vs cost next to the AP3 and intercooler. Esp with Summer coming up.
I wish someone would do a real full on set of datalogs for 2-4minutes running the car hard stock. Then do just an intercooler upgrade and do the same road/log again, then average the HP over time against each other. I bet the intercooler would add 20-30hp a average over time vs simple looking at one gear pulls or one 20-120mph run.
This ecu just turns down power so much with heat ( rightful so, not complaining ).