BD Diesel Exhaust Manifolds 07.5-18 6.7 cumminsThese BD Diesel exhaust manifolds help you maximize your engines true potential. Your stock manifolds can require extensive cleaning and machining to be recovered from warping and distortion. These heavy walled manifolds are coated to resist corrosion, with some models even predrilled for pyrometer probes. BD Diesel exhaust manifolds are great preventative upgrades whenever you're doing other engine work.