extra cat bad for MPG?
08-24-2007, 10:13 PM
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extra cat bad for MPG?
I have a d16y7 (where the cat is attached to the header) I could not afford to get a new header with that cat on it and my buddy just gave me his smog d16y7 exhaust pipe (he added an extra cat on the pipe) I feel a little power loss but I wanted to know if this would affect my gas mileage at all?
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