Stainless Works Catback V6414100S 2-1/2" Mandrel bent, 18 gauge 304 Stainless Steel 1964-67 Corvette Exhaust system - big block - standard trans. CNC Mandrel Bent 2 1/2" 18 gauge 304 Stainless Steel. Designed to replace factory system and connect to factory correct manifolds Exhaust System