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I know this is an old post but I have been researching this very thing as I want to go with an all aluminum radiator (likel Mishimoto probably) for my 2011 LS-X Sedan (1.8) and found that my car is like this one from this post that already has a stock external Auto tranny cooler that is separate from the radiator: http://www.8thcivic.com/forums/civic-coupe-sedan/205640-auto-trans-cooler-diy.html See the second photo that points to #1. That is the external stock cooler.

I did a search on Advance Auto's site for radiators for my 2011 LX-S Sedan and the 2011 Si and they both show the same radiator as a direct fit. So based on what I'm seeing it would appear that as long as the non-Si version (auto) has an external tranny cooler then it may be a direct drop in.
 
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