We just ran some testing at a dyno facility in Iowa and measured everything with the dyno logs. We saw little to no gain on 2 completely different setups with water only. It dropped the EGT's by 300 degrees and that allowed more fuel to be added and that's where the power came from, but it also raised cylinder pressure which is just what folds rods up in a Duramax.
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Tuners of quick and fast Duramax pickups.
"I would rather lose going fast enough to win than win going slow enough to lose."
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