CR Performance EngineeringF-150 EcoBoost 3.5L Performance Manifolds – Sample Castings Inspection Posted on 2017-02-182017-03-12 by CRP Engineering 18 Feb Today at CR Performance Engineering we have completed our casting inspection and we are moving forward with machined samples. More details on this great product coming soon. CRP Engineering CRP Engineering F-150 EcoBoost 3.5L Performance Manifolds – Sample Castings HE551V Rebuild Kits Now In Stock