If you have a look through one of my threads, its the one about my car, I've put up pictures of my mates car "WHOSUP" the lime green ke30 with a 5 litre on nos, tubbed, cage etc. It can be done, but on his the firewall was moved back around 325mm and enough room was left for an under bonnet supercharger, let me know if you need to ask any more questions and ill pass them on...