Joined this site a few days ago & have been reading thru a lot of good info here. I closed off the 6 resi's then turned & clamped open the flapper on my '19 TB Custom Dbl cab with 5.3L last night. As mentioned earlier it does make it a little bit loader, mostly at start up but with the Dura-tracs I struggle to hear much difference driving down the road. Thinking of maybe getting a Borla muffler only, (not entire exhaust) this summer?
BTW I turned the flapper clockwise until it stopped, then clamped it, now I'm wondering if it's ALL the way open? Obviously can't see where it's oriented, can someone confirm?? Thanks!!