[merlinmol]

Originally Posted by Dominic Toretto Took a closer look at the pics last night, the Roush does seem to have larger vents for air to route through. -Alex

I have the Roush upper and lower on my car, not only is the opening larger between the fins, they are at an angle as well. The fins are not short either, they are long to make sure the air is directed where it needs to go.