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2003 2500HD Exhaust Brake
I had one installed and it works great. I also had a 4" exhaust and the engine/exhaust noise inceased about 5-10% on an already loud duramax. My only problem so far was the installer had many problems and took 2 days on what he admitted was a 4 hour job. They also screwed up the wiring and I lost my Cruise control till I figured out where the error was.
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