Early 90's Jap turbo's reliable? Hahahahahahahahahahahahahahahahahahahah (breath) hahahahahahahahahahahahahahahahahahahahahahahaha.
Audi RS, Mercidies AMG, BMW M, Renault Sport, VW R, etc are all massively over engineered these days, just look at what power they leave on the table for the aftermarket tuners, think 60-100bhp with drive trains that can handle it.