Part Number: 12118FLT. They dimpled their tubes at the port to make more room for the header bolts and they parallel ground their flanges to assure a tight seal. Their patented Warlock bypass muffler won the SEMA best new product award for its revolutionary open or closed design in 1996.
Never looked at instructions till after I was done installing,and they say it won't work with a c6,but they fit like a glove. They are a creamy dreamy. Knuckles.