I have 4" all mandrel bent pipe off the turbo, no cat, no muffler. It splits to 4" duals behind the transfer case, then turns 90 degrees up through the bed and into 5"x48" tall bullhorn style chrome stacks angeled outwards at 45 degrees. Sounds nice with the stock tune, but sounds AWESOME with the SCMT HP tune.

You want screaming loud turbo whistle? This is the way to do it!

BTW, I picked up a solid 2mpg with this exhaust.