Power/torque figures are just pub talk, found this from experience. An engine can produce 400bhp, but if its only making decent power in one place it's no good. Take whitegv's 335bhp 5e, couldn't touch a 270bhp 4e. He had a bigger turbo, spooled slightly later than a td04 on a 4e, ad didn't want to rev to the limiter like a 4e would, in return a short band where there's power to use. Also, more oil pressure issues with a 5e, don't get me wrong, if I'd have built a 5e I'd prob say different, can only go from what I've seen. Take a look at zisco's new GT he's building, going for record with that, and its a 4e!