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Chevrolet Express
Platform: GMT Van

removing the stock muffler,resonator,and air filter box

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Old May 13th, 2020, 3:46 PM
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Default removing the stock muffler,resonator,and air filter box
will removing these parts and replacing them with after market parts hurt mpg??
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Old May 13th, 2020, 4:47 PM
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most likely.

GM optimizes them for economy, emissions, and noise.
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Old May 13th, 2020, 6:32 PM
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thanks Joe.i'll just put a quality air filter in it and leave it stock. thanks for your honesty
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