- is Japan's anal emissions policy: you *must* rebuild/replace your engine at ~60K Km.
As result - many fine engines with 35-40 K mi. reach US market for $350-500ish depending on model, seller, the weather. (First person hearsay re my particular model is: of perhaps a dozen reported such swaps, over the years - no one has gotten a lemon.)
Fortunately my 5-cyl is well-established as a 250-300K Mi runner, with just normal maintenance. But I'd do the JDM swap sans augenblick, if it came to the nasty improbable.
fwiw