hey everyone i have a 1991 civic that i plan to swap in a b16a. i have been researching the topic but i still have a few questions. I understand that the wiring harness from the stock engine will not directly work with the new SiR because of the additional 4 wires. if i use the SiR wiring harness or a 91 si harness, will i the 4 addiotional wires connect to the harness with without modification to the harness or ecu? I have read something like that and i am confused. Another question, besides the replacement of the ecu, wiring harness and moving the battery to the back, are there any other electrical modifications that need to be done when swapping the engine. I know i will be able to tackle the mechanical aspect of the swap but the electrical has me confused. thanks.