Exhaust System - 1967-68 Ford Mustang Eleanor Side Exhaust System. Our exhaust system is made by Stainless Works from Ohio. The entire system is made of 304 Stainless Steel with a limited lifetime warranty. The mufflers are made with louvered cores, a directional feature that reduces sound and drone while maintaining a high flow rate. Systems dyno tested with and without our mufflers show only a couple percentage pointes reduction in horsepower with the mufflers in place. This is the easiest exhaust system to install on the market, no cutting or welding required. It's a very simple bolt on exhaust that looks good and fits nice. Available for mustangs with and without sub frame connectors(Heidt's or Global West). US $695.00