The primary function of this silencer is to enable the safe use of the factory horsepower boost connector. That connector richens the mixture, thereby stressing the catalytic converter in the stock silencer. The Vince silencer has no catalyst, so the (overheating stress) issue is resolved.
The silencer is beautifully made and matches the stock mounting locations absolutely perfectly. It seems quieter to my ears than the stock silencer, noting that the primary noise source is the intake snorkel, at least for the rider.
At my altitude of 7500 ft above sea level, the power increase feels like it is completely in the mid range. There are no issues, just seat-of-the-pants-felt mid range torque increase.
I have no take on changes in fuel consumption.
At this price, it is the best buy for those not working under the motto "why use lead when gold will do".
Highly recommended.Rating: [5 of 5 Stars!]