Click here to enlarge Originally Posted by chris_r Click here to enlarge
Didn't mention the Z20LET, as turbocharged engines in pretty much all forms of racing including IPRA have their capacity multiplied by a factor of 1.7, meaning that a 2.0 turbo engine is the equivalent of a 3.4 litre naturally aspirated engine. That would put the OP in a different category again as opposed to the 2000cc and under.
Well that explains that Click here to enlarge

Thanks!