That i dont know. i presumed it was S3 injectors but never actually asked if they were needed.
But IMO lose everything the k03 has to offer. I think a 2+ k03 would be a better drive on UK roads than a k04 stage 1.
for a stage 2+ K03 with 280Hp (at best)
Intercooler £500
Intake £350
Downpipe £500 (Add another £500 for the cat back)
HPFP £350 (autotech is cheapest option)
Turbo Discharge/charge pipes £250
Remap £500
Total: circa £2-2.5k give or take different labour charges
Thats the car now maxed out on its setup. Nothing else to come without swapping the turbo.
My Octavia S2+ was as quick as a stage 1 Ed30 on the road particularly so in gear, but maybe not flat out top end of the rev range, but that involved a loud intake, loud exhaust, high boost, etc etc. It might be mildly better but not by a huge amount, and in a flat out pull a K04 would pull it due to the top end.
For me, i prefer quiet cars i dont like loud exhausts or intakes on an everyday car. Had i known i could have got the same performance running the car less aggressively with the option of progressing further up the tuning ladder, this is without doubt what i would have done.
Stealth performance FTW. All the performance with none of the downsides to modifying.