I had the over $500.00 cat back duals( another brand ) installed a few months ago on my 2001 with 14,000 miles and an Airaid, and with the baffels at the end of the pipes out, I get the loud drone at about 2,000 rpm, BUT my gas milage shot from ( no mistake ) 19 to 14 M.P.G. Any ideas ? Tex
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