991.1 pse function
#16
Rennlist Member
it does look like open valves make it louder.. for sure. #3 and #2. I have a few post i need to correct.... Side muff are always in use. Open Valve just opens the center of the center muff at the same time.
Last edited by SilverSFR; 07-09-2024 at 04:15 PM.
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baby991 (07-09-2024)