What's the deal with this then? Is there a kit or guidelines as to what needs to be bought and fitted for it to work? I've seen the other threads and there isn't much actual specific detail. I have a 1.8tqs AJQ engine with a turbo on its way out, is a ebay sourced original ko3 TFSI turbo a decent replacement on a sensible budget (around £500 with fitting). If so what about mapping, does it have to be custom or have tuners released any maps that work with these turbo upgrades.