For my F150 FX4 2004 Super screw 5.4L:


I want to order Magnaflow cat back system w/ Dual straight out back and dislike the side dual out.

i just learned that #15827 has a bit more rumble and sounds than #15834.

I want #15827 but dislike side dual out..

I checked some info thru few website and found out that these 2 parts # has the same size muffler itself 5x8x18 oval.

so i wonder if these 2 parts # use the SAME type of muffler?

If no, whats muffler part # that came with 15827 part # ? so i can have a muffler shop to do the tail pipe jobs (duall out straight)

Thank you!
YOMAN!