Super Competition Sidemount headers deliver the most aggressive style and performance for your early Corvette. Sidemount headers are built from lightweight 18 gauge tubing. Sidetubes slip directly to the collector for a leak free seal. Replaceable Hooker mufflers are available separately in 2 different styles; glasspack and reverse flow. The glass pack style provides the highest performance with minimal backpressure and sound control. The reverse flow is designed for maximum sound control.