While doing some serious research for my own car I came across this from Awesome GTi. This is a stage 3 system and you would need to have done some basic work on the car first. Also look out for a service interval of about 5000 miles or less. If you abuse it, it will blow up in spectacular fashion.
APR 1.8T 150/180 Stage 3+ Turbo kit
APR announces the Stage III+ kit, the ultimate turbo system upgrade for post 2000 150/180 1.8T engined VAG cars. This kit is capable of 340 horsepower and 332 foot-pounds of torque at the flywheel, while retaining stock-like drivability. The highlights of the kit include the following:
APR Twin wall tubular Exhaust Manifold
Garrett GT28RS Ball-Bearing Turbocharger
Larger APR designed Mass Airflow Sensor Housing
APR Custom Cast Silicone Intake Hoses
APR High Flow Fuel Injectors
Uprated Fuel Pump & 4 Bar Pressure Regulator
All Associate Plumbing and Hardware
The power increase with the APR Stage III+ kit for the 150/180 1.8T is substantial - a front mount intercooler is necessary to sustain power levels. It is also highly recommended that brake and suspension upgrades are done to safely use the potential of this upgrade.
Mk4 Golf 150HP car with performance exhaust, intercooler and induction kit.
APR 1.8T 150/180 Stage 3+ Turbo kit APR-STAGE3- £4495
If you want this kind of power ur better with a 6cyl car like an R32. Stock R32 plus basic upgrades and some basic weight reduction should easily match this level of performance without sacrificing drivalbility. It would cost less as well.