Since I have ran into a few problems along the way, I would like to make a few notes on here so others can learn from my mistakes. Exhaust and Manifold issues. -First, you can not mismatch manifold. The h22a exhaust manifold bolt pattern (where it bolts to the head) is slightly larger. Going along with that, you can not use an H22a top half and a h23a lower half or vice versa. They must match. -The bolts that hold the manifold to the cat SUCK. I bought a die grinder and tourch and it was the ONLY way to remove them. -The cat flange on the JDM H22a manifold is slightly larger then the H23a's cat flange. 2 out of the three bolt will line up. What needs to be done is you need to have a machine shop drill the third hole to make it fit perfectly. Spark plug wires. -If your like me, you decided to use the h23a harness, so therefor, you must also run the h23 distributor because the harness needs an external coil. So you need new wires. You would think that the h23a wires are what you need since you'll get the dizzy to coil wire. Well you wrong. The h23a sparkplugs are located about an inch or so higher in the head then the h22a. Therefor the sparkplug wires are about an inch or so shorter, and if you try and use them, you won't be able to clip onto the plugs. Don't be like me and waste $50 on some nice NGK wires only to find out you can only use one of the wires. Throttle cable linkage -If your doing this swap on an Si model Prelude, and your using your orginal throttle cable, you'll need to flip the cable holder on the intake manifold upside down. I know there are some other things that I will post to this when I remember them. All I can say, unlike many other people have said, this is NOT the easiest swap you can do for a honda. I have done a swap on a del Sol twice, an auto to manual plus d15something - d16z6 swap on a civic, swap on 2 other civics, and all I can say, all the other ones were done within a few days, this has taken forever.