If you plan on swapping the head of the A3 to a A2 you should rework the bottom end while you're there. I suggest bumping up the compression a bit and swapping the A3 oil pump for a A2
X2... 09' TSX most likely is low mileage, mint engine. Don't crack it open to swap head. Besides the TSX head flows just as good as a K20A2/Z1 RSX head.
Q.What ecu work will i need done.(remember just replacing lower end)
A. NO ECU work is required, but you have the option of KPRO later down the road.
Q. Will the stock IM and EM work with the k24 block?
A. Yes, once you keep the PRB head both IM and EM will work.
Q. Will it fit under my stock...
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