aFe Power 48-42010-YC Twisted Steel Header/Y-Pipe (Street, Non-CARB Compliant) Added an astounding +32 horsepower and +44 lbs. x ft. of torque as verified by our in house dyno Constructed out of 16-gauge, 1-3/4 inches mandrel-bent stainless steel tubing for unrestricted flow 4-to-1 formed merge collectors eliminate flow blocking turbulence Incorporates high-Flow, 48 state-legal 400 cell catalytic converters for improved flow This product is not CARB exempt at this time and is not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles