Stainless Steel Manifold Header For Acura RSX / Honda Civic Si SiR (2002-2006) 2.0L DOHC DC5 Engine

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Stainless Steel Shorty Header for 2002-2006 Acura RSX Base & 2002-2005 Civic Si

The K20A3 and K20A2/K20Z1 engines represent Honda's legendary K-series engineering—high-revving four-cylinders that reward proper modifications with genuine performance gains. Your base RSX or Civic Si features proven VTEC technology that comes alive at high RPM, but restrictive factory exhaust manifolds limit power throughout the range. Our precision-engineered shorty header eliminates this bottleneck, unlocking mid-range torque and top-end power while adding the aggressive exhaust note that makes wringing out a Honda so addictive.

Optimize Your K-Series Powerband

Experience immediate improvements across the RPM range as precision 1-5/8" mandrel-bent primaries feeding a 2-1/2" collector optimize exhaust scavenging. The shorty design focuses gains where you drive most—idle through mid-range RPM—delivering stronger pull from low revs while maintaining top-end breathing for those glorious runs to redline. Feel enhanced throttle response, improved acceleration, and the mechanical symphony of a properly-breathing K-series engine that Honda enthusiasts crave.

Race-Quality Construction, Street Reliability

Crafted from premium 16-gauge 304 stainless steel with full mandrel bending throughout, this header delivers lasting performance. Laser-cut 3/8" thick head flanges are hydraulically pressed flat for leak-free sealing, while professional TIG welding at every joint prevents cracking under thermal stress. Chrome-plated flanges resist corrosion where temperatures are highest, and the polished finish protects against rust while looking stunning in your engine bay. This is the quality serious Honda builders demand.

Direct Bolt-On Installation

Designed specifically for base RSX and Civic Si applications with proper port matching and factory mounting points. All necessary accessories shown in photos are included for complete installation. Note: This header is engineered for base RSX models with K20A3 engines and does NOT fit Type-S models, which have different port configurations.