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**The Rocknrod** · 06-19-2021, 09:30 PM

I remember that commercial.

That was a vacuum actuated baffle on the mufflers: http://justacarguy.blogspot.com/2016...t-cutouts.html

06-19-2021, 09:30 PM	#6
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: What is this under the truck? I remember that commercial. That was a vacuum actuated baffle on the mufflers: http://justacarguy.blogspot.com/2016...t-cutouts.html __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?