i have been running my 20v for a month now and had no problems.i did the convesion myself dew to the prices quote for it.i used the golf agu engine&gearbox with the halltech fully mappable ecu.the engine is standard at the moment & is running at 190bhp&278 nm toque.it uses standard g60 driveshafts,radiator&gear linkages.imade my own front mount intercooler which cost me £190 also made all the indution&intercooler pipes myself,all this just to keep cost down.i am really pleased with the end product & it goes like hell.total cost including buying the corrado was £6000.
i debaited over the same question for about a month ,after driving both the vr6&g60,i dropped a 20v turbo in mine just for allround driveability & tuneing.i have had abit of tweaking on the management & its now running at 190 bhp 278nm,at 0.9bar