Petr Svoboda from the Czech Republic transformed his Škoda Fabia into a 4WD race car. He started with a first generation Fabia and gutted the entire powertrain. In its place is a turbocharged 1.8 L inline-four from an Audi TT that makes 221 horsepower (165 kW). The engine connects to a Quattro 4WD drivetrain using custom front and rear subframes. Other upgrades to the 2292 lb (1040 kg) race car include a AP Racing clutch, Brembo Evo calipers and S2000 rotors (front:4 piston, 350x35mm rear:2 piston, 300x28mm).
Source: Project Fabia 4×4 FB page
If you can swap an Skoda Fabia mk 1 whole drivetrain for an Audi TT one could you do the same to an slightly smaller VW Polo 6R 2015 ,3door . And how much for the total conversion for a very fast road car ?