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Exhaust flapper valve quick cheap fix

b lindy

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Been looking at ways to lock the flapper valve in front of the muffler open to get a little more roar out of the tailpipes. Finally went to Home Depot, spent $9 on two 3/4” x 1-3/4” clamps and a metal 1-1/2” corner brace. Took under 5 mins to clamp down and lock in the corner brace to one of the gaps on the knob. Now the flapper valve set to open.
I will eventually get a new exhaust, but this is a perfect quick fix until then
 

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Did your exhaust noise change??
not too much, i can actually hear it idling instead of being dead silent. i also covered the back 3 resonators on each side of the tailpipe with some high temp aluminum tape, so theres a little more noise back there.
 
Been looking at ways to lock the flapper valve in front of the muffler open to get a little more roar out of the tailpipes. Finally went to Home Depot, spent $9 on two 3/4” x 1-3/4” clamps and a metal 1-1/2” corner brace. Took under 5 mins to clamp down and lock in the corner brace to one of the gaps on the knob. Now the flapper valve set to open.
I will eventually get a new exhaust, but this is a perfect quick fix until then
Which way to "open"? With my truck running I rotated CounterClockwise (toweard rear) and got the most flow. Also looked at a youtube where a guy had cut out a muffler and it looks like CCW was the way to go. He has muffler upside down in this video.


Another one supporting CCW -

However....This one is the contradiction......Looks like it rotates CW with actual flow -

1659519116442.png
 
Last edited:
Which way to "open"? With my truck running I rotated CounterClockwise (toweard rear) and got the most flow. Also looked at a youtube where a guy had cut out a muffler and it looks like CCW was the way to go. He has muffler upside down in this video.


Another one supporting CCW -

However....This one is the contradiction......Looks like it rotates CW with actual flow -

View attachment 3742
I did what the LMFSCREW video did. i turned it clockwise towards the front of the truck which tightened the spring.
 
Question about the grill type resonators.
My 2021 TB 6.2L does not have the grill-type resonators...has glass -pack type resonators near the end of the pipes.
Has anyone had those removed. Better sound afterwards (along with the flapper fix)????
 
Been looking at ways to lock the flapper valve in front of the muffler open to get a little more roar out of the tailpipes. Finally went to Home Depot, spent $9 on two 3/4” x 1-3/4” clamps and a metal 1-1/2” corner brace. Took under 5 mins to clamp down and lock in the corner brace to one of the gaps on the knob. Now the flapper valve set to open.
I will eventually get a new exhaust, but this is a perfect quick fix until then
I did something similar to this, keeping the flapper open & using some HVAC metal tape covered my rear resonators. Much better sound. This will hold me over till muffler needs replacing.
 
Question about the grill type resonators.
My 2021 TB 6.2L does not have the grill-type resonators...has glass -pack type resonators near the end of the pipes.
Has anyone had those removed. Better sound afterwards (along with the flapper fix)????
6.2's don't have the mesh. I cut off the muffler and flapper and kept the resonators. It sounds good to me. I used a Magnaflow muffler delete pipe.
 
I'm thinking, and I am just thinking. Does cutting void warranty? I do realize that yawl have TB's that are a few years older than mine. And maybe have traveled outside your warranty's. But I have both my original and an extended warranty on this new truck. Not sure if I am willing to gamble with money on my warranty that I have built into my payments. Just to lose that peace of mind. Or correct me if I am wrong.
 
I cut mine off the 3rd day I owned it after buying it new. It's the same as a cat back exhaust. It would only void any warranty on the exhaust after the catalytic convertor.
 

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