No offence, but what's behind your statement that these guys can do up to 330 bhp in the best way possible?
No worries. They work closely with Volkswagen/Audi to develop their engine conversions and have done since the days of the Beetle, Mk1 and Mk2. Both my 20 year old Mk2 and my Mk4 were tuned by Abt and both are still going strong with 90,000+ miles on each. I don't know about now, but they used to have factory approval on their conversions. They are certainly still sold as new cars through VW and Audi dealers in Germany. VW provide cars to Abt for development of their engines/suspension etc prior to the cars being launched.
They also prepare and race cars in DTM (which they won), German Formula 3, Nurburgring 24Hr and prep all the Polo Cup cars.
To be fair, 330bhp is what they are expecting from the Golf R engine. They offer a 300 hp upgrade for the Mk6 GTI. Downside is, they are expensive.
