HI EVERYONE

I've got a 2002 mk4 1.8T golf:
AUM engine code.
Stock EVS Gearbox.
Single mass uprated flywheel conversion.
Uprated clutch.
Uprated forge actuator with blue spring.
Bailey recirculating dumpvalve
4 bar fuel regulator.
NGK Iridium sparks.
3" High flow Full cat back miltek system.
3 1/2" high flow de-cat.
3" Cold air induction kit.
FMIC capable of 450bhp.
Uprated Cupar R fuel pump.
Relocated map sensor.
Boost gauge.
Am looking into upgrading to gt28rs turbo.
Wondering if anyone know what else il need and have
Any tips ..
Cheers