Not Ranked
Stainless Specialties uses a perforated core not a louvered core like most others, so it doesn't matter which way you install them. The matting is whatever John says it is. I'm not going to cut them open to find out, especially considering what they cost. 
Frank
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FFR - V8, Manual Trans, PS, Inop Wipers, No Radio, Gas Mileage so-so
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