4 - inch stainless constant - diameter pipes. Turbo Back System with Polished straight - thru muffler. Outflow stock. 5 - inch polished Chrome or Cerakote Black tip. Includes Power Elbow. ISB PICKUP Constant - diameter to slash backpressure and lower exhaust gas temperatures, Banks' Monster exhaust pipes bolt behind the turbocharger. The streamlined 4 inch turbine outlet pipe, head pipe, intermediate pipe and tailpipe are formed of stainless, heavy - wall tubing with constant - diameter bends to outflow stock and the competition. Banks replaces the factory's restrictive muffler with a polished - stainless Monster muffler, featuring a straight - through 4 inch diameter flow - path with a Banks - designed expansion chamber to dissipate the annoying mid - range exhaust drone that plagues most straight - through mufflers. Muffler utilizes spun ceramic, very - high - temperature packing and delivers an authoritative - but never intrusive - exhaust sound. The huge 5 inch polished - stainless steel tailpipe tip sports a rolled edge. And to help keep it looking good, there's a 12 inch air gap to keep heat from tarnishing the finish. An adjustable clamp lets you position it on the tailpipe just right.