Re: 2006 4.7 oem exhaust drone!
So I figured out my issue. The factory muffler had a hole in it right on top. I felt around before I pulled it off and couldn't feel any holes or anything, but it was obvious when removed. Good thing I didn't find it with my fingers when I was searching around because it is sharp.
Anyway j just installed a magnaflow knock off last night and dumped it before the rear axle. Sounds pretty good with very little drone. I actually have a resonator I was trying to finish last night but I ran out of time. For how small the muffler is I'm actually surprised it isn't very loud at all. The same size muffler on my Titan sounded like a beast. Then again the Nissan makes somewhere around 30-35 more horsepower and was a 2-1 muffler so maybe the 2 inlets and power had someone to do with it. That Nissan droned really bad before I did a helmholtz resonator too.
So I might need headers or something because this was just too easy. Usually I try to make better flow and then fight to quiet the exhaust. In this case it is strait through with little noise. I even went to the parts store with the exhaust cut off to grab a clamp and it really wasn't that loud. Sounded like turd but wasn't very loud.