I'll take this one piece at a time.
1. You can use your A3 tranny just fine and in my opinion it works very well with the additional torque from the 2.4L. Other people have different opinions though.
2. You do not need an RBC manifold, but it might be useful. I can't remember if the RBC has the coolant port to match up to the coolant port on the TSX head, but if it does that makes it additionally useful. The stock intake manifold will work just fine though you will need some sort of solution to the coolant port. Easiest and best is the Hasport adapter plate.
3. Use your stock throttle body. Maybe send it off to Maxbore but thats about it.
4. Mounts. With the exception of the passenger side motor mount bracket you can use your stock mounts or stock replacements like the Hasport rear mount or any other brand you choose. For the passenger side use 2002+ CRV motor mount bracket Honda Part # 11910-PPA-000.
5. You need K-pro. It is a must have for this swap. No stock ECU that I am aware of will be sufficient.
6. For bolt ons in most cases you will use the bolt ons for the EP3. One glaring exception to this is the header. With the header you have to worry about clearing the sway bar. Most shorty headers will work just fine, but many of the race headers have issues. I'm running a custom set up and don't remember which works and which doesn't.
7. See number 2.
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