The performance of the Slip-On Line exhausts can be further enhanced with the addition of the optional stainless-steel header. When this beautifully finished header is added to any Slip-On Line exhaust for the Z900, it turns the muffler into a complete racing system and increases power to even greater levels of enjoyment. The addition of the header will also improve the sound of the exhaust, giving it a crisper racing tone.FITMENT NOTICE FOR US MARKET: Exhaust system does not fit on 2020 Z900 US model. For 2020 US models, see products listed under 2019 model year.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.