What size are the factory pipes? for a 1999 5.4 f150?? i think i would like to buy the same size factory pipes and use a SUV performance flowmaster...anyone had experience with those?? and have single side exit....maybe angled duals. does anyone have any comparasion opinions for the Suv performance mufflers compare to the 40 series ones?

thanks

 

My 02 SuperCrew with 5.4L and factory exhaust has a 2 1/2" tailpipe.


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