I've been doing a bit of reading regarding the flapper mod - is it just as simple as pulling the vacuum hose out and sticking a ball bearing within the hose and refit it?
So, does it imply that engine vacuum to the valve diverts it to a "quieter" chamber, and without vacuum, the exhaust routes through a more "straight through" channel and thus sounds barkier?
So, does it imply that engine vacuum to the valve diverts it to a "quieter" chamber, and without vacuum, the exhaust routes through a more "straight through" channel and thus sounds barkier?
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