These pistons are a compression ratio of 9.8:1 with a wrist pin size of 21mm,they are a standard replacement for Golf R/S3/CUPRA/CUPRA R- all k04 based cars,they can also be used in k03 based 2.0tfsi engines to convert the compression ratio up to that of a k04 based engine (Golf R/S3/CUPRA/CUPRA R). Wossner pistons are to be found in engines operating at the highest levels of motor sport, in competition and, of course, in everyday use – in fact, anywhere where longevity and performance are important factors. Their products are the source of the superior power behind the success of well know motor sport teams at national and international race meets. They develop, build and produce top quality pistons for both important international engine manufacturers and individual customers active within motor sport. Inside their fully air-conditioned, 2500 Square meter machine shop, 2 of the latest CNC controlled machines guarantee a quality and precision down to the micro level.