HMF 013213726186 Performance Exhaust: Buell Buell 1125 Fits: 08-10 Slip On Elliptical Low mounts Euro-Polished End Cap EQUAL POWER: The Performance Series distributes power evenly throughout the entire RPM range. 4-6 dB INCREASE: Depending on the model, you can expect a 4-6 dB increase over stock. UNRESTRICTED CORE: The Performance Series uses a 2 1/8 non-restrictive core for maximum flow.