Kawasaki's newest street bruisers are great bikes for pounding the pavement, but the stock exhausts are a bummer. They're not only big, heavy and ugly, but also restrictive and too quiet. The solution is a Two Brothers Racing dual slip-on system. It is ten pounds lighter than the stock pipes and also increases horsepower throughout the rev range. The sleek twin cans are available in an aluminum, titanium or high temp carbon fiber finish and offer great sound, looks and performance.