Quote:
Originally Posted by keiri
It's very possible that it's not an emissions-based restriction but an aural, noise restriction; the exhaust will be louder and less muffled while providing the extra 3HP bump.
At least, that's what I suspect...
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I'm pretty sure it's purely for marketing reasons--simply because Japan and Europe use ps (DIN hp) and the US uses SAE hp and Toyota's marketing team decided that "200hp" sounds better than 197hp, while in Japan/Europe "200ps" sounds just fine.