I have a 1995 Gmc C2500 6.5L VIN F truck. Am considering upgrading the exhaust system. Am trying to figure out if my truck has a catalytic converter or not. In the exhaust pipe just before the muffler is what appears to be a small muffler or resonator or something. My shop manual has a diagram of my exhaust system but did not say what that thing was before the muffler. It is my understanding the VIN F trucks have little or no emmissions on them (EGR, Cat, etc). I want to be sure if my truck came with a Cat or not to avoid problems later with state inspections and such. Any help would be appreciated.