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A swap from an 03-07 Accord would be a lot easier and cheaper, for what it's worth. I'm choosing not to go with the Accord engine because 1) The Civic Si engine has more horsepower, torque, and better fuel economy, 2) The Civic Si has a taller transmission with more gears, 3) The Civic Si has a limit slip, very useful in winter.
Here's a nearly complete list of what you'd need for the Accord swap:
From the doner car:
-K24 engine out of an 03-07 Accord
-Accord transmission
-Factory Accord ECU
-Accord engine bay wiring harness
-Catalytic converters, resonators, muffler (if you choose to keep emissions systems)
Additional parts:
-Rywire or Wirewox or CJs harness adapters (CJ is cheapest)- let the Accord harness "talk" to the car's body harness ($200) - you could in theory do this yourself for nothing if you're very good with electrical diagrams
-Civic EM2, EP3 or DC5 spindles (also called knuckle) (4 lug EP3 is 2002-2003) (Might be <$20 from junkyard)
-02-05 Civic front lower control arm ball joint adapters (fits EM2/DC5/EP3 spindles and lower ball joint) - *IMPORTANT* With these adapters, machining of the stock lower control arm will be required, needs to be drilled out slightly. You may or may not be able to do this, but a machine shop could do it in 10 minutes. ProfessionalAwesome has these for $150.
-~2.25-2.5" exhaust ($$??)
-Hasport engine mounts (no price yet, but could be ~$500 on the upper end)
-axles will be specific to engine placement, we'll know this once Hasport has their mounts out
And that's it. The Accord engine is almost a perfect drop-in replacement, and everything else is off the shelf. It's also still cable throttle, and the Insight's throttle cable will bolt right up. Any other swap requires fabrication and/or additional parts.
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