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Compression brake noise (also known as “Jake Brake” noise) has been a significant issue for heavy duty trucks for several decades. As a result of compression brake noise, there are many local ordinances in North America banning the use of engine brakes, and some countries such as Australia and South Africa have in the past considered total bans on compression brakes. Previous research showed that the primary problem is caused by operators who remove the OEM muffler system and replace it with a “straight stack” exhaust pipe with no sound reducing properties. On the other hand, even with the OEM exhaust system in place, compression brake noise is sometimes significant. The introduction of exhaust aftertreatment to meet stringent 2010 EPA emissions requirements (diesel particulate filters and selective catalytic reduction systems, DPF + SCR) provides two potential benefits for compression brake noise.