PLM Power Driven K-Series K20 Tri-Y Header – Honda Civic Si FG / FD / FA (2006–2011)

PLM Power Driven K-Series K20 Tri-Y Header – Honda Civic Si FG / FD / FA (2006–2011)

SKU: PLM-HFG1-HEADER

Product Description

The PLM Private Label Mfg. Power Driven K-Series K20 Tri-Y Header is engineered specifically for 8th Generation Honda Civic Si models (2006–2011) equipped with the K20 engine. Designed to replace the restrictive factory exhaust manifold, this header significantly improves exhaust flow, throttle response, and overall engine efficiency.

Featuring a proven 4-2-1 Tri-Y design, this header enhances low- to mid-range torque while still supporting strong top-end power—making it an excellent choice for both daily-driven street cars and performance-focused builds. The true 2.5-inch collector ensures smooth exhaust scavenging and optimal flow into the rest of the exhaust system.

Constructed from high-quality 304 stainless steel with CNC-machined 3/8-inch thick flanges, this header is built to withstand extreme heat cycles while maintaining a precise, leak-free seal. The multi-piece slip-fit design allows for easier installation and proper alignment, while the included extension pipe, gaskets, and hardware provide a complete, bolt-on solution for your Civic Si.

Key Features

• Designed specifically for Honda Civic Si K20 engines

• 4-2-1 Tri-Y header design for improved torque and power delivery

• True 2.5-inch collector for optimal exhaust flow

• Constructed from 304 stainless steel

• 18-gauge stainless steel tubing

• CNC-machined manifold flanges

• Flange thickness: 0.38" (3/8")

• Multi-piece slip-fit design for easier installation

• Includes extension pipe

• Includes gaskets and required hardware

• One-year limited warranty

Vehicle Fitment

• 2006–2011 Honda Civic Si

• Chassis: FG / FD / FA

• K20 engines only

• 8th Generation Civic Si

Installation Notes

• Designed as a direct replacement for the factory exhaust manifold

• Professional installation recommended for best fitment and performance