The F355 OEM has a butterfly valve that activated by a vacuum switch, that opens the valve at 4,500 rpm and above. That's what gives it the sweet high pitch sound when the car is on full song. This unit is built-in in the tail pipe. If you're using Tubi then it'll be straight fit, remove your Tubi tailpipe and fit the OEM in it's place.
Posts by Stradale
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