The link you posted had dyno tests included and it definitely showed an increase in power. This has been proven for years on V-8's. The Bonneville salt flats have been called the great white dyno and the ultimate track. JD's roadster is the fastest ever in it's class and has been since Noah first sold him the aux 302 Jimmy from the Ark. I personally feel the reason racing sixes develop more power through a single exhaust is because there are fewer pulses and that allows them to help scavenge each other. Maybe Tom Lowe can do this in a future dyno test. I doubt if it makes any real difference on a street car.
