aFe BladeRunner Ported Ductile Iron Exhaust Manifold 07-11 Jeep Wrangler (JK) V6-3.8LaFe BladeRunner Ported Ductile Iron Exhaust Manifold 07 11 Jeep Wrangler (JK) V6 3. 8L Bolt on instant performance by upgrading or replacing your restrictive, cracked factory manifold with this BladeRunner port matched manifold. Designed to outflow the stock manifold by 12% for improved throttle response, the BladeRunner manifold has both the inlet and the outlet ports machined to match the factory ports for a smooth transition and optimal flow path.