Fuel type: Standard European super plus fuel. More or less identical to US 93 octane fuel. Injectors and fuel pump should be identical (although I will reconfirm this matter with my tuner).
Both cars use the same built engine (compression 10:1).
Both cars differ because the tuner's car is using a different turbo and a larger diameter header. Moreover, I expect the tuner's car to use a metal cat with less cells. (My car uses metal cats with 200 cells.) In addition, the tuner's car is a MT and not an AT.
Addendum: I understand that the HKS is only slightly larger than the GTX2867R. Moreover, it seems that max. air flow of the 2867 is about 48 lb air/min. The HKS should make about 52 lb air/min if I correctly understand these figures:
http://www.clubwrx.net/forums/engine...olume-etc.html