4 into 1 exhaust header in stainless steel, designed to fit the Opel GT with an original 1.9L CIH motor. Excellent performance upgrade for any well-built CIH motor. Includes bottom mount ring flange, collector (2.0" O.D output) in both stainless steel and mild steel, ring gasket and hardware. Includes our part #10012a gasket. Suggested parts #6048 or part #6048A bolts (also see our part #7038 motor mount heat shield). Will also fit Opel GT's with 2.0, 2.2 & 2.4L Opel CIH motors installed. Designed to fit the Opel GT. (If you have a Manta A or Ascona A or Kadett B model, or if you want an alternative for an Opel GT, also see 10023SS for our "Shorty" style header).