These headers were designed to be a cost-effective alternative to the infamous “eBay” headers. They are unequal length and stainless steel. The O2 bungs come shortened to allow proper fit and function of the oxygen sensors. In many cases, the firewall must still be clearenced to fit one of the O2s once installed. Typically, this entails some hammering before installing the headers. OEM manifold gaskets are recommended; however, we leave the included aftermarket gaskets in the package.