what kind of gains can a guy see from that intake manafold pictured above?

 

Nice intakes. Love the machined look. You guys working on any Duramax parts?

 

We have not had a chance to dyno before and after the manifolds. I have made several of these manifolds using this design over the years mostly on competition vehicles, on a flow bench they increase flow a few CFM over no manifold at all. The idea is to have as much volume as you can as close to the valve as you can. The plenum holds a large volume so the runners can refill as quickly as posible. This is the first design that has been made of billet aluminum. I will make Duramax parts if you need them what do you need.