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You can't see it in the pics but there is a butterfly in each exhaust pipe that looks to be actuated by the pot in the picture above (one on each pipe). It looks like it's for a straight pipe exhaust when you want it or diverts exhaust through the perforated outer portion when you want it to be quieter.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***
"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
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