Sequential Multiport EFI

I don't know "what all" is out there. The relatively new Holley HP and the more expensive Dominator systems are VERY configurable, and are "self learning."

The software interface with MegaSquirt "makes" it self learning.

I recommend you do not get too hung up on "sequential" After all, carburetors are not. Many many high performance engines, either OEM or "built" are NOT sequencial, but are variations of bank - to - bank or batch fire.

From what I've read..........

sequential mostly affects idle and emissions, and low speed driveability, and doesn't seem to have all that much (percentage) effect on HP, or even much in the way of driveability for the large part of the throttle range.