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4 thoughts on “Cummins engine sound for Peterbilt 579

  1. That is not what the new ISX sounds like! This sound is nothing more than a pickup truck -_- your paccar was way better than this poor excuse of an ISX

  2. Trucker_bob

    drunk? :P nice mod! nicely made

  3. Does not sound like a cummins ISX at all

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