i will answer the first 2:
1.) to answer your question: there's no replacement for displacement. Straight and to the point. That and you get's gobs of torque.
2.) The answer is alittle complicated. What result do you want? What's your poison? Turbo, Surpercharge, N/A? The k24a2 which is found in the TSX is basically a factory 2.4L "stoker" of the k20a2 found in the RSX-S. You do have a higher compression. I think it's somewhere around 10.6. This engine is expensive to get. Around probably 2500-3200 depending on mileage. Now, If your going to use force induction as your power adder, than the best route to go is make a "poor man's tsx". Bottom end k24a1 fround in a 02-06 CRV, with a k20a2, z1, z3 head. These can be found in the RSX-S or 06+ Si. This will give you true Vtak, but a lower compression. 9.6 to be exact. this combo can be found for 1000-1600 depending on condition, and after selling a few not needed parts on ephatch.
Another route would be to simply get a k24a1. The head still has the VTEC-Economy technology, but the flow characterists of the head are similar if not better than the flow in the k20a2 head. Search for the flow chart. I've found complete engines wil very mileage for under 800 clams. The good thing about the k24a1 is if your are swapping directly with no power adders and **no cams** then you can basically upgrade your injectors to 310cc and run the stock ep3 ECU. The benefits is that you get around 20ft# of torque above the 20A3.
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