Your probably right, I'll give them a ring and see what the difference is. I've got a n/a cossie lump in her but I was thinking the cc isnt much difference than the original RS2000 lump but its a non turbo so im going to have fun explaining the different engine to the person.
I could give them a list as long as my arm with everything that has been done tho, from the lsd to the rollcage and all the other wee bits and pieces.