Already got it mate got 3 inch system all way through to the back box
sorted then and if your buying new bits its not cheap 
I know well without turbo the other bits I need will set me back 2700 then map 600 so just turbo that's next issue still thinking if I wanna go stage 3 or not
have r-tech map it only cost me 300odd as i have not long done most things your looking at ko4 cost me 770 for a new genuine item 300 for the manni and 270 for a new pump and full 3inch exhaust then removing old turbo and fitting new bits then map 
What bhp you running and mods?
i never built the car just had to put new turbo an stuff on it when i bought the car as they were f*cked

TT 225 9.0:1 Compression piston’s
Audi TT225 Manifold
Audi TT225 K04 Turbo , brackets and oil feed pipes
Audi TT225 Fuel Pump
Audi TT225 Injectors
Fly by wire Inlet Plenum (Modified for throttle cable)
4 Bar Fuel Pressure regulator
Helix Organic Clutch
New Big End & Main Bearings
New Oil Pump
New Head Gasket
New Cam Belt Kit
New Metal Bade Water Pump
FORGE 008 Dump Valve
Pipercross TT225 Air Filter
VR6 MAF Housing
SFS Silicone Turbo Intake Pipe
CUSTOM REMAP BY R-TECH
Modifications done when converted to four wheel drive:
Boot floor out of 4 motion golf
Rear Subframe, diff and suspension from R32
Audi TT225 6 Speed Gearbox and Transfer box
Audi TT225 Flywheel and ECS Tuning Kevlar Stage 3 Clutch – good for 400whp
Golf 4 motion Propshaft and front drive shafts
4 Motion Controller made by Dutch Build
Customs Stainless Exhaust less than 3month old
KW Variant 3 Audi S3 Coilover Kit (fully height, bump and rebound adjustable)
Vibra Technics Road engine Mounts
Custom Front Mount Intercooler
Custom Hard 2.5” Intercooler Piping painted black
Forge Intake pipe with Dump Valve Relocator
Goodridge Braided Brake Hoses
Forge Rear Camber Rod’s
Chassis Modifications:
19” R32 Style Alloy Wheels
235/35/19 Hankook v12 evo's
Porsche 996 turbo front callipers
356 x 32 front discs 308x22mm ECS big discs kit for rear
25th Anniversary rear callipers
Body Modifications:
Genuine R32 Rear Spoiler
Genuine R32 Side Skirt’s
R7A Design’s Rear Valance modified to have twin round pipes
One off front bumper, modified to use original grille, and late type plastic mesh
Full re-spray in Sprint Blue