[bmoore2156]

I have the ppe race and 4'' tb exaust and shortly after I installed it I started hearing a growling noise that comes and goes. It usually happens when I let off the gas the the rpms are dropping through 600 to 1000 range. Every once in a while it will do it when it is at an idle (not moving). It almost sounds like a tire rubbing noise that happens when I am at full wheel lock with my 285's. Does anyone have any ideas? I am running the ppe on level 3. I have about 12,000 miles on the truck.