Blow three-step exhaust systems for Milwaukee Eight models are designed to work with the exhaust inertia pulse and give a broad power band on 107CI 131CI Milwaukee 8 engines. Three-step headers are not be confused with straight drag pipes. These are true high performance exhaust systems. We encourage you having your engine dyno tuned after installation by a professional dyno tuner for maximum performance. Available in solid chrome, solid flat black, chrome with flat black heat shields or flat black with chrome heat shields. Note: these exhausts do not fit hydraulic clutch equipped models. Please check your local regulations about exhaust systems prior to purchasing.