We tested a ton of great popular intake manifolds, one on a mild 427 and the other was a solid roller 427. The power disparity between intakes was quite interesting to see! A 55 horsepower difference between manifolds on the hydraulic roller and then a 116 horsepower difference on the solid roller. More air flow demand shows your intake manifold begins to matter that much more! We appreciate every company that jumped on board to help, BoostLine Performance for building the engines and dynoing ea