Gen 3 Hemi dual plane.

Stock 6.1L intake is 12" +- .25" short side, and 15" +- .25" long side with an average runner length of 13.5" +-.25" My intake has a runner length of 7" - 7.5" on all runners. I don't catch the same pressure wave as the the stock 6.1L intake but it is a tuned length runner in a performance RPM band. I can give a few more specifics when I get home tonight.