For Honda Accord Performance 4-2-1 Design Stainless Steel Exhaust Header Kit (Polished Chrome) Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability 4-2-1 High Performance Racing Spec. Design / TIG Welded CNC Machine Flange Flex Pipe Insertion for Flexibility and Extra Durability / O2 Sensor Bung Insertion and Metal Gasket Included Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. / 1.75" Inlet / 2" Outlet Fits 98-02 Honda Accord 2.3L l4 (Professional Installer is Highly Recommended, No Instruction Included)