They all flow very well.
Gasket matched ocp will flow very close to a stock 6.1. A stock 6.1 flows very well.

The stock 6.1, ocp, cascar, ritter and new drag pack all serve different purposes.

Stock 6.1 and ocp need a gasket match. The ritter needs a bunch of plenum work and a gasket match. Cascar looks nice. Someone supposed to bring me one to look at and maybe port on his next trip to Charleston.

Guys should be picking intakes on runner length. Even the ritter can have longer or shorter runners depending on if its a 4150 or 4500 intake