[URDiesel]

No muffler equals lots of turbo noise and when the vanes are closed it's even louder!
Put a muffler on it! Tunes won't change it. A muffler will help a lot.

 

[URDiesel]

WTF??? Who wants the truck to sound like a buzzsaw taking off for the moon? I appreciate it. I realized that it doesn't make that sound when the exhaust brame is off, but who wants to remember to turn off the exhaust brake before starting a truck remotely just to turn it back on when driving to avoid that sound...

You didn't happen to lose connection with the ECM/PCM once in a while for no reason at all did you? I also can't seem to clear my codes and get transmission pressure low code sometimes even though it regularly hovers around 170. Also wondering how we can get it to read EGTs & and barometric pressure, mine both stay static. If I ever get them to answer on the phone I just want to have all my questions answered.

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Are they still in business ? Most have closed shop!

 

[URDiesel]

I have a muffler on it just like Chris, it's the tune when the exhaust brake is on.

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I leave my exhaust brake on 100% with a 4 inch exhaust and muffler. It never gets that loud!
You can only hear the Turbo when the high idle is active.