[mr0077]

Lew, you're right, I am running dual quads. I agree that a single 9" on a single quad would cause more restriction for the (more or less) same air flow my motor would use. I ran a `4" x 3" element when I had a single four bbl on it.

Actually, two 9" filters have more surface area than the factory-style oval with the same height filter element (1 3/4")...