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On the L99 cars, there are a couple of "check-valves" on the rear exhaust pipes, that make an almost embarassing noise when going very slow, they are there to try making the exhaust tone,not sound like a 4-cyl, when the car in in "Auto-Fuel-Managment" mode. It doesn't work, still sounds like a sick Cow! the GT Mustangs sound so much better than our Camaros, when one spends 43K for a muscle car, you should not have to spend an additional $800 to $1200 for a good sounding exhaust.
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