Has anyone used an AEROTURBINE muffler and seen anything like the claimed drop in EGT ?http://www.dieselplace.com/forum/smileys/Ermm.gif

They also claim 4 mpg increase in mileage as well. My friend almost had one installed on his 6.0 PSD, but just went with the Magnaflow system. I questioned the guys at the shop about the claims in the brochure, but they stated there have been a lot of happy people who have had it installed.