BD Diesel 08-10 Ford F-250/F-350/F-450/F-550 Powerstroke 6.4L Up Pipes Kit w/Manifold Set6. 4L Power Stroke OE exhaust issues are not an 'if' but a 'when'. Prevent these issues with BD's stronger Exhaust Manifold & Up Pipe Kit. 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