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Corsa extreme without NPP doesn’t utilize the valves. So there will be no change in sound.
NPP open would sound different as you are basically bypassing the muffler. I guess I’m a little confused with the question.
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2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.
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