SRS EXHAUST SYSTEMS 4-2-1 EXHAUST HEADER STAINLESS STEEL (HONDA D-ENGINES)SRS manifold 4 2 1 Civic and CRX D series The SRS manifold 4 2 1 stainless steel fits the D series engines of various Honda Civic and CRX models. 4 1 = More power at low rpm Including connection lambda probe Extra power with SRS 4 2 1 manifold The design of this 4 2 1 manifold gives your Honda Civic or CRX D series engine extra power at low rpm. You will notice this when you pull up. For the 88 91 models, make sure that you have enough space at the