This cat back system will bolt up to a BA, BF XR6 or Xt 4.0 lt engine. It is manufactured from mild steel it has a 2.5 inch pipe with two good sized mufflers, it comes with duel tips. This system will give a great sound that others will admire. The X force system is a proven performer on the dyno and race track. Pictured is a stainless steel system. 00020821