B-Series SP Header 4-2-1 Tri-Y B18 B20

The B-Series SP Header 4-2-1 Tri-Y B18 B20 is an enhanced version of the original B-Series SP Header. It is specifically designed for Honda B18 and B20 engines, offering improved performance and efficiency. The "4-2-1" design refers to the configuration of the exhaust manifold. It features four primary tubes that merge into two secondary tubes, which then merge into a single collector. This design helps to optimize exhaust flow and increase torque throughout the RPM range. The Tri-Y design further enhances performance by utilizing a unique three-step design in the primary tubes. This design helps to scavenge exhaust gases more efficiently, reducing backpressure and improving overall engine performance. The B18 B20 designation indicates that this header is compatible with both B18 and B20 engines. These engines are commonly found in Honda vehicles, such as the Integra and CR-V. By providing compatibility with both engines, this header offers versatility and convenience for Honda enth…