What is the correct part number? I am fixing to order one but don't want to order the wrong one. I am getting just the replacement muffler for my 4.6 scab.

 

It all depends on what you want...

Stainless or aluminized?
Single In Single Out or Dual Out
In/Out pipe diameter?
Overall size of muffler 5x8, 4x9, 5x11?

 

Go the magnaflow website and look there.

 

I put 12245 on mine sounds good on a 5.4, not real loud and no overwhelming drone at highway speed. SISO using stock exhaust

 

I am looking for a SISO. As far as size what is the most common?

 

What difference does the size matter? I noticed on the mufflers you can get center/center, offset.. What does this do to the sound? The setup I am looking for is a replacement for the stock muffler and having it dumped right out of the muffler.

 

Mines 18"

 

Can anyone help me out on what the difference is in the size of the mufflers as listed above?