I'll try to put all of this in some sort of order.....
I'd got the car to Stg2+,with about 360bhp and 360lbs,and obviously to go any further,there's only one way to get a substantial gain,and that's to change the turbo.
The K04 tops out at around 360-380bhp,and even for those that claim to have got more,the thing is on it's last legs at that sort of power.
Hybrids,such as the Turbo Dynamics K04,do offer a bit more,but even then,you won't get beyond 400-420bhp,so that didn't seem like a worthwhile course either.
That left one of 2 routes....
Either the BSH WOA kit,using a GT3071 and tubular manifold,or the ATP kit,and the latter is substantially cheaper,so that was the one.
The last picture below is the entire kit,laid out before being assembled and fitted,but as with all US kits,some things don't fit,and some parts,such as the induction kit,aren't needed.
What you do need is listed below:
For up to 440bhp....
1.Turbo kit.....either ATP or BSH,with a GT3071 or GT3076,although if you can get one,the GTX series turbos will give about 10-15% more flow.
2.RS4/R8 injectors....the stock injectors run out of flow at around 400bhp.
3.RS4 fuel pressure regulator.
4.If you haven't already got one,a good CAI such as the ITG kit,and a good exhaust.
5.Bigger intercooler.....I chose the ProAlloy as it's the biggest currently on the market,but the THS also works.
As well as this,you'll need someone who can adapt the turbo kit's exhaust downpipe to fit a RHD car...more later.
You would also be needing.....
Big brake kit....VWRacing,AP,Brembo etc etc.
If you want to be able to use the car properly.