SSI manifolds are a simple bolt on item that makes horsepower. Not only does this manifold make more peak horsepower, but it makes more low end and mid range too. A recent dyno session at Dynotech Research proved it. This is a great way to bolt on an easy 3-5 horsepower. 4-5 hp in the mid and 3 peak!! They are made of TITANIUM for the highest quality, lightest weight and best appearance.