I can't imagine my mostly exposed engine with Ford's clunky cast iron 'beauties'. Power - it's warmed over a bit, has a nice lumpy idle, looks good - and will still use 87 octane gas if necessary. It's something like a K&N filter - yep, they'll pass more air, but even my 10 cylinder truck pulling my 11K pound camper up a hill in scream gear wont see more then 4000 rpm.