The X-Pipe Brand Crossover pipes are used to connect OEM style headers (including Bassani's) to the OEM type or Bassani cat-back muffler section on vehicles with true dual exhaust systems. The Bassani X-Pipe֠features mandrel bent stainless steel tubes welded into a unique x-shaped stainless steel chamber that utilizes technology similar to what is used in NASCAR. The X-Pipe comes in two versions, Off-Road (without catalytic converters) for those that dont have to worry about smog restrictions or for race-only applications, or a w/Cats version with 50 state approved catalytic converters for applications that are street driven and need to be concerned about the smog restrictions within their state. By installing Bassani's X-Pipes you will notice increased power and better fuel economy without sacrificing reliability.