The BD Full Bore Exhaust Manifold for the Chevy Duramax engine replaces
factory driver’s side “pinched down” unit, restoring exhaust flow
and balances the V8 engine for smother running. Flow design will accommodate
enhanced performance engines by aiding them in improving exhaust velocity to
drive the turbocharger, improving power, increasing economy and lowering
EGT’s. Made from high-silicon ductile iron, the Full Bore is a direct,
bolt-in replacement for the factory manifold and is even drilled and tapped
to accept the most popular EGT probes.

Replaces factory driver’s side “pinched down” unit
Restores exhaust flow and balances the V8 engine for smoother running
Improves exhaust velocity to drive the turbocharger
Improves power
Direct, bolt-in replacement
Tapped to accept the most popular EGT probes
High-silicon ductile iron
Lower EGT’s