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I'm not sure of any aftermarket exhaust that still uses a flap like the stock exhaust, but you could always look into using electronic exhaust cut outs where you can basically bypass your mufflers by opening up a set of valves. Not sure if that's exactly what you are looking for though.
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-Michael.
Berlina Black S2000 CR is now in the garage 
l 19" Rial Daytona Race l KW V2 l Eisenhaus Race Exhaust l |