I have a 99 f150 5.4 i wanna run true dual flowmaster 40 or 44 with no cats how will this sound? and also what size pipe should i use 2in, 2 1/2in, or 3in?

 

I have a 302 with true dual magnaflows and no cats. It sounds amazing. Im not really all that sure of the difference between flowmaster and magnaflow sound wise but I love mine. I have 2.25 inch pipe im pretty sure. I would highly suggest it though.