First, is this a good price on an x pipe?
http://portland.craigslist.org/mlt/pts/511659832.html

Whats the real way to run true duals. Do you use a single muffler, DI/DO? or one muffler per pipe, which sounds better?

anyone one have pictures of the underside of their truck with true duals, curious to see what it looks like.

right now i have a si/do 40 series muffler dual out the back with rolled tips. Dont really like the sound or performance. It sounds like a truck it just dont have that mean powerful v8 growl to it

 

Everyone has their own opinion but i did 2 seperate mufflers to make easier cause i did it myself.

 

https://www.f150online.com/forums/other-aftermarket/3119-extang-vs-tek-style-better.html

This guy has a nice install.