Looking for ideas, I think I want the Borla dual cat-back exhaust, any drawbacks? What the benefit of a cat-back exhaust? I don't want anything loud, but louder than stock, and smooth. For a true dual exhause will I loose my spare tire.

Thanks

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2001 Super Crew XLT 4x4,Toredo Red/Harvest Gold, Tan Interior, 4.6l, Keyless Entry,Towing Package,Captain Chairs, Line-X Bed liner, Limited Slip,3.55 axle,Skids,and Sliding Rear Window