H-Series Headers

About

Explore PLM’s best-selling H-Series headers, crafted for Honda and Acura enthusiasts seeking top-tier performance. Designed for Civic, Integra, and Accord models, these stainless steel headers eliminate exhaust restrictions, boosting power and efficiency. With Tri-Y and 4-1 configurations, they’re perfect for competition or everyday performance upgrades. Frequently Asked Questions How can I confirm which header is the correct fit for my specific engine and vehicle chassis? Ensuring you select the correct header for your vehicle is crucial for proper fitment and optimal performance. We strongly recommend cross-referencing your vehicle's specific engine code, chassis code, and year with the compatibility information provided on each product page. For example, a header designed for a Honda K20 engine in an EG chassis will be different from one for a K20 in an EK chassis. Our product descriptions clearly list the compatible engine and chassis codes (e.g., B-series, K-series, D-series, LS, S-chassis, EG, EK, DC2, etc.). If you are unsure of your vehicle's exact specifications, please consult your owner's manual or a reputable automotive resource. If you still have questions after reviewing the product details, our customer support team is always ready to assist you in confirming the correct fitment. What is the performance difference between a 4-1 (Race) and a 4-2-1 (Tri-Y) header design? The choice between a 4-1 (Race) and a 4-2-1 (Tri-Y) header design depends largely on your driving style and desired power delivery. A 4-1 header features four primary tubes that merge directly into a single collector. This design is typically optimized for maximum top-end horsepower, making it ideal for high-RPM applications such as drag racing or track use where sustained high engine speeds are common. It tends to shift the power band higher up the RPM range. In contrast, a 4-2-1 (Tri-Y) header features four primary tubes that merge into two secondary tubes, which then merge into a sin