I don't think its that Honda's just handle boost better, I think its just what people assume because a lot of people have boostifed hondas. A Toyota/Nissan/etc stock internal motor could probably handle the same ammount of boost of a stock internal Honda, its just that not many people have tested out Toyota/other manufactures to see. Know what I'm trying to say?

I don't know, let me know if you see what I'm trying to say.