ok so i got a 03 supercrew 5.4 w/ gotts mod and silencer removed. now im planning ahead to get some long tube headers, magnaflow muffler. just want to know if this muffler is the way to go im routing it to come out infront of the back pass. tire. i want to get the si/do and what options do i get im confused.. also can i run my stock cats
You cannot keep the front set of cats with LTs but you can keep the rears. Personally, I would scrap all 4 and go with Magnaflow 94106 hi-flow cats, and have the rear O2 sensors mounted after them. Dual muffklers with an X pipe would perform just a pinch better, but you can use a DI/DO so save some and get the same similar results.
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