Yep they finally released the GDA header. It is 4-1 design and from what I hear a work of art. It will decrease spool up time and increase power across the board. Obviously, this header is designed for large turbochargers but from what I hear it works amazingly well. It is the only TRUE equal length header available and from what I hear makes the HKS and Cusco ones look cheap. If yo have not heard of Maxim Works you'll find theur exhaust manifolds on all the WRC and Prodrive cars.