I've got an 00 f150 x-cab flareside 4x4 5.4 and I was thinking about putting a single chamber flowmaster with a y-pipe and duals. I know it will be pretty loud but that's what I want, I'm just not sure what it would sound like. My old 97 4.6 f150 had only a y-pipe in place of the muffler and duals and it sounded great but I only got 12 mpg. If anyone has heard a 5.4 with a single chamber flow please let me know.

 

Man, I bet that would sound good, especially on a 5.4. Seems like those have a better sound than the 4.6's.

 

I've got a 1 chamber flow with a turndown after the muffler, I had the two rear cat's removed and it's loud as h3ll! If its the big block muscle car sound you want I would highly suggest it. It won't be that loud until you remove two of the four restrictive cats.

Good luck,

P.S. I've got photos of my setup in my gallery.

-Adam

 

Did you get any codes by removing the two cats?