Exhaust brake sound nightmare
2014 3500. I had a bad exhaust manifold leak last year that got worse and worse. It would make a reed valve sound when my exhaust brake would engage and eventually would make it when turbo spooled up. Ended up replacing the stock manifold with a 2 piece BD unit and while they were there I did the banks heater grid and intake horn. Noise went away for 10k miles or so.
I took it on a 2000 mile trip towing my camper and it started making the sound again on exhaust brake and while pulling hills spooling turbo. Also wasn’t getting full boost. Took it in again and replaced every stock elbow with mishimoto silicone boots as well as added an exhaust mount just past downpipe that was not there. They also checked all of the work they had done on manifold and said it was fine.
Anyways I get the truck back and have to use it immediately to haul again and it is still making the sound while engaging the exhaust brake. But if i gas it and then engage it again it sounds normal. I am getting full boost but the sound is annoying.
What else can I look at? I was going to check the egr delete plates and see if there is signs of leaking there. Anything else to check that’s easy?
I do trust the shop and I really don’t think manifold is leaking again.