Stainless Steel Manifold Headers for Acura RSX & Honda Civic Si SiR (2002-2006) 2.0L DOHC DC5 EngineStainless 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 engineeringhigh 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