Muffler Delete

frogstomper · April 14, 2015

I had mine done at B&B Muffler of Crosby and 35. I might need to go back because my exhaust is rattling when i rev it it up and then let off the gas. not sure where its coming from. could it be the flapper valve rattling ?

Update : clamped the valve open rattle stopped.

How did you clamp the valve open? Is it possible to get a picture?

theloneracer86 · April 14, 2015

How did you clamp the valve open? Is it possible to get a picture?

I just went under the truck with a hose clamp twisted the valve open and clamped the 2 squares together to hold it in the open position.

14'SilveradoLT · April 15, 2015

I just went under the truck with a hose clamp twisted the valve open and clamped the 2 squares together to hold it in the open position.

Same way I did it, extremely easy and got rid of the exhaust rattle in that section. My next step is to remove that 3rd cat.

ProModMike · June 11, 2015

Just been thinking. Thoughts on if I run the 22" Magnaflow part #12589 in place of the stock muffler, but move it forward as close as possible to the cat and leave the flap valve and resonator in place? My goal is to get some mild rumble at idle, some grunt when I stand on it, and NO drone while I'm driving people down the freeway.

chadchad1111 · June 12, 2015

1GT424CGXBF155294 I have a 2011 gmc sierra truck here is the VIN so you know exactly what truck I have, any problems with exhaust for these years cants find anything good on this site to tell me ..cheers

Velocibiker · June 24, 2015

Muffler deleted. Local shop did it for $50. Took about 45 minutes. The V8 actually sounds like a V8 now.

robvas · June 26, 2015

Just been thinking. Thoughts on if I run the 22" Magnaflow part #12589 in place of the stock muffler, but move it forward as close as possible to the cat and leave the flap valve and resonator in place? My goal is to get some mild rumble at idle, some grunt when I stand on it, and NO drone while I'm driving people down the freeway.

Leave the resonator but ditch the flapper. You'll be happy.

ProModMike · June 26, 2015

Leave the resonator but ditch the flapper. You'll be happy.

Are you running this or have you heard it? I think this could be a winning setup.

robvas · June 26, 2015

Are you running this or have you heard it? I think this could be a winning setup.

I'm running a magnaflow with the flapper removed and the resonator left in the tail pipe

ProModMike · June 26, 2015

Outstanding. And your take is it's what I'm looking for, (and like 90% of the guys on here)? Little noise but without the drone?

bass mechanic · July 2, 2015

I'm running a magnaflow with the flapper removed and the resonator left in the tail pipe

i just did this on my 15 denali 6.2L sounds great! but a little more quiet than i was expecting. i may remove the resonator next and or the flapper valve.

ewbldavis · March 16, 2016

Saturday. $60. Can't wait.

Daryl Z71 · March 16, 2016

Shortys are lol!

I disagree.

ewbldavis · March 19, 2016

Another video. Why not.

Total cost was $63.90 and took about 1/2 hour

1300c · March 20, 2016

Another video. Why not.

Total cost was $63.90 and took about 1/2 hour

Can you hear the flapper valve rattle in person like others have mentioned? I thought I could vaguely hear it but it's hard to tell on cell phone speakers. Sounds good!