In order to help retain low RPM torque, you want to avoid full dual exhaust systems as the decrease in back pressure tends to cause a loss in low to mid RPM torque. A good cat back, Single In/Single Out or Single In/Dual Out setup is a good way to help pick up a little power on the top without killing the lower RPM. Magnaflow is a good combination of price and quality, and is probably the most popular brand with the F-150 crowd.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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