[bobcowan]

If you have a close to stock engine, then a factory EFI system will work well and be cost effective. But if your engine is somewhat radical, then you can use an aftermarket system and get excellent results. You just have to know what you're doing and be willing to work at it.

The self learning procedure works rather well, but it's not perfect. Once the computer does it's thing, you'll have to go in and make the appropriate changes to get it to do what you want.

A lot of people have trouble with the 8 stack systems. A lot of that trouble comes from not understanding their strengths and weaknesses, not tuning the hardware correctly, and not using the proper matching parts. IR intake systems are a different animal, and you need to build the engine to take advantage of those differences.