Factory up-pipes are prone to failure due to age and heat cycling causing leaking exhaust, slower turbo spool, as well as additional exhaust noise and soot buildup. BD's larger diameter 304 stainless steel mandrel bent up-pipes with internally shielded expansion bellows, are designed to minimize restriction to the turbo and improve exhaust velocity and turbo response time. The BD Up-Pipes are a durable, longer-life replacement for the common Power Stoke problems as well as the perfect complimentary upgrade when replacing a turbo, manifolds, or other engine or transmission repairs.