Does the power tube replace the muffler or do you add it into the exhaust piping to speed up the flow. Just wondering what the word on it is. I have a flowmaster muffler on the truck now and I want to get a mbrp muffler to replace it.

 

http://www.mbrp.com/main.php?powertube

 

I was lookin at it too. Im waiting for someone to try it and tell us if it works at all.