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Blow Performance three-step exhaust systems are designed to work with the exhaust inertia pulse and give a broad power band on 107CI – 131CI Milwaukee Eight engines. Three-step headers are not be confused with straight drag pipes. These are true High Performance exhaust systems for closed course competition. Blow Performance encourages having your engine dyno tuned after installation by a professional dyno tuner for maximum performance. Note that these exhausts do not fit hydraulic clutch equipped models