Circuit Werks latest Header for K20 or K24 swapped cars! Fits '88-'01 K-swapped Honda Civics and '90-'01 K-swapped Acura Integras. K20 and K24's might not work with Hasport motor mounts in some models. Depending on the mount height variances you may have to modify the subframe for fitment Features a true 4-1 tubing design with Megaphone for much better exhaust flow delivering the best peak HP gain. Specialty design Megaphone at specific location to create a scavenging effect to increase HP and Torque. 2.5" collector with 1.88" runners. This two piece design delivers the best performance while still utilizing your factory OEM Catalytic converter. Our headers are designed and engineered to maximize exhaust flow and increase both horsepower and torque throughout the power band. All gaskets included. If you have any questions, feel free to contact us.