I'm looking at my set-up, trying to determine why I have such excessive noise and vibration. The muffler's out-port is offset to one side, which which way do you have it mounted? Offset towards driver or passenger? Is your muffler perfectly level? Mine seemed to fit better with the muffler ****ed about 20 degrees. Doing that increased spare tire clearance.

TIA

 

I don't know off the top of my head, but I have pics in my gallery

This is the pic I have and how I mounted it...

https://www.f150online.com/galleries...2487&anum=8268

 

I believe the intention was that the MagnaFlow logo was to be visible from under the truck, i.e. the offset exit of the muffler would be on the drivers side. The best overall fit for me was to tilt the muffler a little as well.

 

Actually, best fit for me was the muffler vertical, believe it or not. The "Maganflow" logo is upside down. It runs and sounds GREAT! No vibration or rattle!

 

I don't think mine has that logo at all...

 

Did you get it at a swap meet in Compton?