slo_nlo
+1y
You won't get a cleaner engine bay than you will my ditching all the OEM stuff and running MegaSquirt. The F2T harness is set up for a transverse mount FWD application, so the firewall is right where your wheel well is. It really turns into an ugly mess IMO.
If you want to go with stock ECU, check the mx-6 and performance probe forums. Those guys know all about the wiring harness, etc.
Like I said though, MS is the cleanest option under there. There is only like 17 wires in total that really need to come into the engine bay. Everything else like lights and shit can be routed behind fenders and stuff. They also have PNP MS for those ECUs now so you wouldn't have to make up harnesses. (Not really a big deal, but would save some time. Just run wires where you need em and solder to the F2T harness, done.)