Originally Posted by streetthrowback
All of us should put a list together on what is exactly needed to do the swap.
No two swaps are alike. Some cars are 05, some are 06+. Some do a k20, some k24, some NA, some supercharged, some turbo. Makes it hard to get a list when it depends on what you are doing. There are various threads out there outlining the basic premise. And various parts lists.
Here is a reference for those that don't like searching. Again all swaps are a little different but this is the basics
Swap kit: Mounts, Axles, Shifter Linkage, Clutch hydrolic cable. Cable Throttle Conversion (if 06+). All innovative. If K24 then need stock Honda CRV side mount or similar aftermarket.
Coolant Hoses: Expect to purchase some misc hose/fittings seperately. Some of the existing hoses get shortened a bit. But overall easy. Use Stock K20A2 thermostat housing (should point down and to the passenger side)
Fuel: I personally just ran a new fuel system. As most people know the stock system kind of sucks anyways as it tends to starve under hard cornering. I ran a surge tank to an aftermarket fuel rail. Although it is likely very easy to simply adapt the fuel line from the stock Lotus/Toyota fuel delivery to the stock Honda Rail if you really want to be cheap.
Oil cooler: Stock K20A2 (and K20Z series as well I believe) all have a oil/water exchanger internally that works very well for a street car.. no need to touch it if just a street car or drag car or something. For a car that will see track time you will want an oil cooler. A sandwich plate with a laminova oil/water exchanger or a sandwich plate with a oil/air exchanger (located in side scoops) both work well.
Wiring: Hybrid Racing "universal" harness, plus DIY splicing and modification of the HR universal harness. Otherwise Hybrid racing universal harness + WhatsADSM PNP conversion.
Dash: Stock dash + Hondata Dash Converter. Otherwise aftermarket dash
ECU: Hondata K-pro or other standalone.
Tune: Custom tune
Intake: Figure a "custom" intake. Although that is easy. Just purchase some pipe/couplers/filter
Exhaust: Hytech offers a swap header and exhaust. Very expensive, but very nice. Otherwise you may be able to find a local shop to fabricate a full system for you.
Intake manifold: RBC fits... but barley. Most people end up using a skunk2 intake manifold simply due to a better fitment. Since you are upgrading the intake manifold many will upgrade the throttle body at the same time.
Idler: Stock Honda EP3 civic idler, or K-Tuned.
Emissions: Figure on a catch can just because. The stock charcoal canister gets removed, you can either run without or can adapt a smaller canister on. I have never run the evap stuff myself although I'm sure it can be done. I think Derek has the full evap system working on his.
That is just the basics, but in reality again the parts list is a case by case basis. Notice I didn't even touch on which engine to use, supercharging/turbocharging, or any aftermarket power upgrades, transmission upgrades, etc which you may want. IMHO that is the biggest reason to swap is the aftermarket and the potential that it brings.