With race inspired technology built into every system, you're looking at the very best the performance exhaust industry has to offer. This C6 systems comes with 1-7/8" primaries and 3" x 3" X-pipe. Of course these are manufactured using the highest quality 304 S/S available and require no modifications to install. All systems come standard with merge collectors with scavenger spikes. We also use the highest quality and best flowing metallic substrate catalytic converters available and all systems assemble with Grade 8 hardware and heavy duty S/S band clamps.