Oh so it is kind of like the active exhaust they fit to Ferraris and Astons. It uses a valve to optimise the exhaust gas flow (and noise). Think the seller has hit the proverbial nail on the head by saying he has gone back to a decat to make it sound beefier.
I dont know about anybody else I would be interested to see a dyno of a car with this on to see actual power figures before I part with cash. Nevertheless a good ebay find
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