S3 Power increase

[Phlipper1]

Have had a stage 1 remap from AMD and most mods so far. Any ideas as to best gains for power/reponse other than a turbo upgrade (i.e. breathing improvements).

 

[jojo]

S3, Bilstein, AMD, H&R, R32Arb, Powerflex

Sounds like you have a sorted S3!

Standard Airbox is good for 300BHP, so avoid any performance filters. Freeflow exhaust with sports cats will give you zero gains in performance, but probably gives you a quicker turbo spoolup, so better response? Or you could invest in a FMIC(Front Mount InterCooler) to maximise your available power, by keeping inlet temps low on hot days.
I would have thought you'd benefit from a decent set of stoppers to compliment your existing mods, as the standard setup is only just good enough for standard power, just all my opinions of course.