With the Mustang raised high enough, and the K-member/steering assembly and front sway bar out of the way, BBK's long-tubes can be positioned and cinched down with no problem. Most of the OEM studs are retained. However, there are a few tight areas that require bolts (which are supplied) for securing the headers. The ceramic-coated, mild-steel tubes we're using measure 13/4 inches and feature a 3/8-inch flange. BBK also offers long-tubes in 304 stainless steel, as well as chrome.