you disagree with my post but you don't say why.
if the runners are longer, how can they be the same intake?
the performer is a small step up from stock the the performer rpm and performer rpm air gap are nearly identical but the air gap has slightly less bottom ed performance and slightly higher top end with the difference being maybe 5 to 7 hp . most people wouldnt be able to tell the difference between the two, however, the difference is there which is why i suggested it instead of the air gap for your particular app.
as far as resale goes, the air gap will be a little easier to sell if for no reason that most people prefer the look or simply think it is a far better intake than the rpm which it is not unless it is for a ford windsor in which case, for some reason the runners are larger than they are on the rpm.