If VX has such feature, then it would be illegal to install ANY muffler, other than OEM. Because such swap would temper with actual emissions system... Why would Isuzu condemn their customer to such restriction?
But in a real world, no one is ever this strict (or educated) about emissions
Getting back to this "feature", if there is such mechanical devise, I can see how its malfunction could cause a major power (or fuel economy) reduction.
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