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The muffler system was built from this custom kit Borla offers. All the 3-inch-diameter tubing is T304 stainless steel. We had access to a swedger, which expands the tubing diameter slightly. This is what's necessary to fit over the slip-on collector. Just about any muffler shop can do this.
Thrasher Camaro, Part IV - 1969 Chevy Camaro Exhaust System & Gauges

The muffler system was built from this custom kit Borla offers. All the 3-inch-diameter tubing is T304 stainless steel. We had access to a swedger, which expands the tubing diameter slightly. This is what's necessary to fit over the slip-on collector. Just about any muffler shop can do this.  View Related Article