Unobtanium C8 Stingray Titanium Cat Back ExhaustUnobtanium C8 Stingray Titanium Cat Back Exhaust The C8 Corvette Z51 is a great chassis, but the factory cat back is built around noise limits, cost and packaging more than sound quality or weight. The Unobtanium C8 Z51 Titanium Cat Back Exhaust replaces the OEM rear section with a lighter, freer flowing titanium system that lets the LT2 V8 feel a bit more responsive and gives it a more honest voice behind the cabin. Each system is built from high