Borla Performance stands behind our products by offering a lifetime warranty against defects in materials and workmanship. After nearly 30 years, the reason we are able to do this is because austenitic stainless steel is a superior material with optimum chromium and nickel content to maximize resistance to corrosion and rust as compared to 400 series which contains iron that, as we all know, rusts.
For example, the stock headers on the Mustang have been made of 400 series stainless for some time. Have you ever looked at your stock headers to see how badly they rust? Do you want to buy an aftermarket system made of 400 series? The same grade material as the system you already have?
The Society of Automotive Engineers (SAE) has reported the overwhelming advantages of 300 and 200 series stainless steel over lesser grades like 400. Be clear on your comparisons. Buy the performance upgrade. Buy the quality materials upgrade. Buy the BORLA.
For more details on this subject, please refer to the "About Us" section of this site.