The old internet myth that has doing the rounds for years, no VW did not peg the ABF back and a remap will not get the 20bhp.
The VR6 was never marketed or badged as GTI but was aimed more at the BMW 3 series market, whilst the 8v and 16v were left to the hot hatch market.
The amount of times I read this old chestnut is bonkers, the ABF is one of the hardest engines to get more power from.
To get 170bhp is going to cost you a lot of money, if anything the VR6 is easier to get more power from.