i have a dual 4 bbl one on right now, but only because i can't find anything better to fit under the hood. they are restrictive for flow purposes, so if you can get a bigger filter element under the hood use it. the # i gave you was for the element i can use under my hood. its about 1.75 inches thick. K&N does make a thicker element the same oval size. i think summit racing has them shown on their web site. they are so heavy because they are cast aluminum.
Fred
