nothing is wrong with CA. If I want power in my 240 then I'd do KA-T but for everything else in between(mountain driving, autox, road course) CA is the way for me. I will never put a RB in my 240. As for SR...only if I can't have my CA or KA-T. DOn't get me wrong...all engines are great, just not for me. My CA makes more hp then dohc ka...unless you turbo it then i'll shut up. hahahaha