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Re: Dual exhaust warning
I heard the change in the exhaust note with my 08 gmc. It's definitely from the AFM. I am running a magnaflow, single in dual out. I had the muffler shop run 2 1/4 inch pipe off of it to keep the back pressure correct so it wouldn't affect the fuel economy. Plus I didn't want it as loud as my previous 2 1/2 inch that I have ran on my other trucks. Wanted to keep the drone/in-cab noise down on my long highway trips. Sounds great cruising or getting into the throttle.
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