I also thought this info was neat !! about the 30k mile JDM rule!!

JDM Engines

Japanese emissions laws mandate engine replacemnt at 30,000 miles, so complete take-outs imported from japan are a popular option here in the US. generally The japanese domestic market (JDM) engines have more power than US varients due to higher compression nd a bigger cam. Type R engines, if offers for you engine series, are invariably better than the US version. Searching the web for JDM Engines turns up thousands o hit. Major imprters include MANTARAY MOTORSPORT RACING, NIPPON MOTORS, and REMANUFACTURED.com

If youve ever woundered why every JDM motor you see says LESS than 30k miles !! on it !! that things not even broken in yet !!