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Exhaust brake

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I bought the stock Jacobs brake for mine... Now like BD and some other have made some serious improvements in design for better hold back compared to the Jocobs. I think it the BD exhaust brake that is got a spring loaded valve that allows for a balancing of pressure at high RPM's but when the RPM's get low the valve closes and allows for improved braking at low RPM's. Compared to Jacobs brake its just got a hole in the butterfly valve for pressure balance...

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