Bigger turbo, larger injection pump (increases fuel delivery), lift pump (fuel pump in the fuel tank to boost fuel pressure), larger fuel injectors, exhaust system, and chip tuning.
There you go, cheap as you can = low reliability. You can buy used parts but stay away from d i e s e l vw.com, they sell cheap but junk parts. You don't want to build a car and have it break down and run poorly. And don't forget that at 200 hp that will be around 350-400 torque. You'll be spinning the tires like crazy.
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