Upgrade your car's exhaust and emission system with this KHAOS MOTORSPORTS coupler. Made in the USA from high-quality aluminized mild steel, this coupler has a 2.25" I.D that smoothly transitions to a 2.5" I.D, ensuring optimal airflow. Perfect for use with manifolds and headers, this coupler is a must-have for any car enthusiast looking to enhance their vehicle's performance. Don't settle for anything less than the best - choose KHAOS MOTORSPORTS.