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Npp and back pressure

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Old Dec 20, 2019 | 06:06 PM
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Default Npp and back pressure
Not much of motor head but how does the closed baffles on npp exhaust not effect
back pressure on the motor
tks
merry Christmas.
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Old Dec 20, 2019 | 08:16 PM
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Still enough opening through the other 2 legs of the exhaust?
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Old Dec 20, 2019 | 08:35 PM
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My cam only LS3 dynoed 475 with the flaps open and 455 with them closed. GM says 6 hp less on a stock LS3 with NPP's open vs stock exhaust. I'm guessing NPP's closed on a stock C6 would cost you more than 6hp vs the non NPP exhaust.
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