I'm getting really bord of my 1.8T now and i wanted to go for a KO4 with a decent map, After looking at this i might as well by an S3 which i dont think the misses will go for. Any suggestions would be good? Hello Nick, Thank you for your enquiry ref your A3. I would recommend going for a KO3s hybrid over the KO4 as the KO4 requires a lot more parts and is not direct bolt on like a KO3s hybrid. Gains would be around the same too. Price wise you would be looking at · Hybrid turbo - £1095 + vat · Removing old turbo and refitting new - £240 + vat · Turbo fitting kit, oil feed pipe, gaskets seals, oil etc -£110 + vat · Turbo Intake pipe - £121 + vat · 4 Bar pressure regulator - £50.21 · S3 Injectors new these are around £300 each! I would suggest sourcing some second hand ones · AmD Re-map to suit modifications - £424.68 + vat · To maximise power and be able to up the boost it is also recommended to fit a boost controller this is £250 + £120 for fitting. Hope that helps but if you do have any further questions please do not hesitate in contacting me.