All the diameters and the lengths have to be the exact same as the fast intake in order to get the same power output. Is it possible to gain more than the fast intake through experimentation yes, but it will take dyno time. Anything else beside the exact specs as the fast and it's a shot in the dark or looking for a needle in a haystack. We really need the exact measurements with a vineir or micrometers. Length, height, wall thickness, filter diameter at the base, top and filter height. It would also be nice to have a port built in the side of the intake tract for the air intake temp sensor to mount and make it a little cleaner set up.