Cast 347SS
This manifold is cast from 347SS which is far superior to 304SS. Not only does 347SS last longer at elevated temperatures , there are no welds like those found in traditional turbo manifolds. When a welded turbo manifolds fails, they almost always break at or next to the welds. There are zero downsides to this casting process vs welding. 5 year warranty for new V2 models. V2 models are vastly superior strength wise compared to the V1 & previous gen welded models. 

Tapered Main Runner Inside Diameter
This manifold's inside diameter slowly tapers down as it reaches the T4 flange. This process is only possible with a cast manifold. A traditional welded manifold does not change inside diameter. This tapering process is identical to the volute of a turbine housing. By tapering down it increasing velocity, and speeds up the exhaust flow and increases boost response.

CNC machined flanges
All flanges are CNC machined to be perfectly flat. Most turbo manifolds are just belt sanded flat, which is not as accurate as CNC machining. 

Smoother transitions
Welded turbo manifolds require hours of hand porting with a die grinder, and sanding drums to contour the change in shape from a round tube to a square T4 flange. We have taken this step, just like the rest of the manifold, to an even higher level of quality. The investment casting process makes every transition seamless. Welded manifolds are made from short pieces of cast elbows. Every time there is a joint it is welded, there can be a slight disruption on the inside diameter if the pipe is not perfectly matched, or the weld penetrates all the way through. This disruption is eliminated with the casting process resulting in a better flowing turbo manifold.