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hey guys, i have a 2003 D17 engine, i hear the D16 is better then the D17, can i use a D16 on my 2003 civic or get the D18 or R18,.. anyone,..thanks

 
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No, the only "easy" swap you can do is a k. Everything else is either illegal (emissions) or requires tons of custom fab work, or both

 
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ok then, can i swap the k24 in, from an 2003 accord k24, its auto but i dont care, will it fit right on????? thanks

 
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You would need to do some clearance-ing. And aftermarket mounts. Easiest is to buy a wrecked/rotted RSX and then everything is bolt in, subframe, suspension, etc. Just need to remove one engine bay mount from the RSX and spot weld it into the civic engine bay

 
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start from the stickies on the top of the page.

here is one:
https://www.civicforums.com/forums/7...-swap-faq.html