[bruce65trojan]

4" Turboback full exhaust. Who's making em?

 

[fordpwrstroke7]

A quick search on this website will yield a lot of answers. Check out the 6.7 Performance section.

 

[BIG Laing]

From what I understand, the location of the turbo on the 6.7's makes it extremely difficult to remove the stock down pipe and install a new exhaust. The stock down pipe is large enough to not make enough difference (it's not worth it).