Tough question to answer. My guess is that the six pack setup might have a slight advantage for street use but a good single plane with a big 4bbl will make more peak power. The six pack intake is a cork for a high output engine but it makes great power down low.

A tougher question would be comparing a six pack intake to a Performer RPM. I think the Performer RPM will make more power everywhere on the curve than a six pack but I could be wrong. Either way I doubt the difference is much. So a Six Pack these days is really just about looks. Not that there is anything wrong with that. People like the way the look and they perform pretty well so the only downside is the cost and the weight.

I don't think I'd ever put a Six Pack on any car I owned nor would I be interested in spending the money for a Six Pack EFI, but there are lots of guys who are interested in this. So I think it is cool that people can get what they want now.