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My center one sounded more muffled similar to the pop from an air compressor, whereas the rear one had the more obnoxioius typical Jake brake sound.

If you have the opportunity to road test each Jake individually, could you confirm each sounds the same? My center jake is quieter & I cannot figure out why. I thought it may be due to the firing order or the proximity to the turbo... I'm just guessing but wouldn't mind a second opinion.

Awesome work. I was planning the same thing, but never got around to test fitting everything. Other projects took precedence & the truck got ignored again. Thanks for sharing the measurements, you saved me a few hours of experimentation.