Banks' famous Monster Exhaust is teamed with their Power Elbow turbo outlet pipe for maximum flow & output. The exhaust portion has constant-diameter pipe to slash backpressure and lower exhaust gas temperature with a streamlined 4" turbine outlet pipe, head pipe, intermediate pipe and tailpipe. Banks replaces the restrictive OE muffler with a polished stainless Monster muffler boasting a straight-through 4" flow path & Banks-designed expansion chamber to dissipate midrange exhaust drone that plagues most straight-through mufflers. Kits also include the final restriction, Banks' Power Elbow assembly, that improves the stock turbo outlet pipe backpressure by 60%.