Dont really know that much about the in's and out's of it... I am not a mechanic or pretend to be 1. basically have 2 full hyundai efi set up's including loom's and cpu's. Went into the shop yesterday where my heads are getting done. I have 3 motors getting built. 1 efi blown , 1 efi turbo and 1 quad bike carbs. The efi's have held me up as my block's are all done... As far as i can see, the the hyundai manifold has been welded up abit and then grinded back out about 5 mm to the left. Made a copy of a template (thanks Chris) to suit h89 head, has been welded to manifold and grinded out to match the porting of the head. Running standard 1.5L hyundai injectors for now. And as for the cpu, you can run pretty much what you want.And how much your prepared to spend. If the hyundai cpu's become a problem, I have a box full of nissan 1's. No matter what cpu you get , you probably will still need to get it dynoed. So I am working with the cheaper cpu and spending more on the dyno. Sorry to be so vague.