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I looked into the factory exhaust brake available on 4500/5500's. It's made by Wabco. GM p/n 15091544 - $990 list, 495 + 99 shipping at GM Parts Direct. The control solenoid is p/n 15758155 - $285 list, $162 Parts Direct.


The mounting flange is close to square with the bolts 2.75" ctr to ctr. My flange is rectangular and the short side ctr to ctr is over 3".


It's a nice little unit but after you add in an air comp, tank, valve (not GM's), and exhaust work you might as well go aftermarket.
 
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