without having the slightest clue about what other inline 6s r capable of.... yes u would b crazy.... or like wasting money. Fanboy talk? I recall a certain lone mitsu 4cyl waxing an entire army of 2JZ monsters, not only taking the championship, but set a world record (for the class) on their az in the process. So I don't see whats soooo phenomenal about JZs and if a 4 can rape 'em. Who is to say any other motor can't as well? Set your goal, an chose the appropriate swap candidate.