Diesel Power Source T4i Exhaust Manifold 2007 2018 Dodge Ram 6.7L Cummins Turbo High Flow Cast Iron Direct Bolt On Replacement Faster Spool Performance Upgrade OEM 5135789AB 5135789AC 5135789AD Storage Boxes the tool balances aggressive sanding Combo the tool balances aggressive sanding power with a smooth finish the keyhole design provides a continuous grip and maximum durabilty This precision cast manifold features optimized internal geometry that reduces exhaust backpressure The advanced flow design incorporates smooth internal transitions and enlarged runners that work together to maintain exhaust pulse energy and reduce heat buildup