APDTY 785814 Exhaust Manifold & Catalytic Converter Assembly w/Hardware Fits 2006 Hummer H3; 2004-2006 GMC Canyon; 2004-2006 Chevy Colorado; 2006 Isuzu I-350 (3.5L Engines Only; Replaces 12571601) Heavy Duty Cast Iron Design Meets or Exceeds OE Specificatins