Inline Pro makes hands down the best cast manifold, and probably the best log style manifold on the market... It is made from cast stainless steel, unlike others that are made from cast iron, this is far superior for many reasons... they are also a far superior design, and flow much better than any others... I have personally seen cars at and above 700whp with the inline pro manifolds... do your research and spend the money the first time, instead of having to do it twice...