5.9L Cummins 24-Valve (1998.5–2002) Exhaust Manifolds — VP44 Era Reliability & Flow The VP44 24-valve Cummins (’98.5–’02) is a towing workhorse—but factory exhaust manifolds are notorious for heat-cycle warpage, gasket leaks, and runner cracks, especially on tuned trucks or with larger-than-stock chargers. This guide explains why it happens, how BD’s...

5.9L Cummins 12-Valve (1989–1998) Exhaust Manifolds — Why They Fail & How BD Fixes Them The first-gen and second-gen 12-valve Cummins (’89–’98) built a reputation for indestructible bottom ends—but the factory exhaust manifold is the weak link under heat and towing. Thin castings bow, runners crack, and drive pressure goes...

6.7 Power Stroke Exhaust Manifold — 2011–2016 Fitment, Flow and Install Tips Quiet the cold start tick, stop clamp-load loss, and recover turbo response with BD’s thick-wall, hi-silicon ductile iron manifold set engineered for the early Scorpion 6.7L. Quick Summary: ~75% thicker walls • Average flow gain ~9.3% per port...