The Akrapovic Optional Stainless Steel 4-1 Racing Header Set combines amazing sound with performance upgrades. Constructed using the best materials available, this header set offers a wealth of performance gains and weight reduction. When paired with an Akrapovic Slip-On exhaust, you will transform the sound of your bike!Constructed using lightweight stainless steel.Improved performance numbers.Reduced weight compared to OE.Easy to install.The Akrapovic Optional Stainless Steel 4-1 Racing Header Set is the ultimate upgrade for your bike, being constructed with lightweight, high grade stainless steel. They also offer exceptional performance gains when being used in conjuction with an Akrapovic Slip On line. The lack of a catalytic converter also allows easier airflow thus more power! The power sees a +3.5 hp @ 9,650 rpm and torque sees +1.7 lb-ft @ 6,350 rpm. Weight also sees a reduction down to 0.78kg, a drop of 1.4kg (63.4%)! Fitting the header is a straight forward procedure, expecte