@r5gtt BYD engines already have good enough cams and the same injectors as the S3.
If you want silly power TTE will have an upgrade to the TTE420. You won't need more than that. You'll need to buy just good quality upgrades to make the most of the hybrid turbo.
Peron IC, 3,5" downpipe to 3" cat back from BCS, LOBA HPFP, TTRS intank pump, 155 bar FPRV, new style RS4 injectors, Revo admission, RFD kit, LSD, BBK front and rear, coilovers or sport dampers, MPSS tyres, etc.