Originally Posted by
talonXracer
The easiest, no issue swap would be the K20A2 w/6spd and stock A2 ECU. It is entirely drop-in, plug and play, no fiddling around with getting it to run. The only issue that could even arise could be a possible reverse/shifter issue, and that can be solved with a little trimming of the shifter or a BCss, but again this isnt with every shifter just a very small percentage.
The next easiest/cheapest swap would be a K24/Kpro with the EP3's 5speed trans.
I would opt for a 06'+ K24A2 with base RSX 5speed w Quaiff and TSX 6th added. This would provide the base for continued upgrades over the years with awesome potential and longeviety.
I have a stock A2 shortblock that has been abused severly for close to 200K miles, with reasonable goals and limits the stock blocks are fine and provide more than enough fun with excellent fuel mileage.
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