This is what I did to mine. I gutted the airbox and smoothed the inside for better flow into the intake transfer pipe. Then I cut masonite to fit snugly into the cavity leaving lots of room underneath. I then cut a hole for the inside area of a auto filter I cut down to fit and sealed with sensor safe silicone. I will be replacing the filters with K&Ns later. Then I took a Cheap 20 dollar Pep Boys Holley 4bbl Velocity stack and cut the salad bowl so it fit inside. I trimed inside and the ring of the stack till it was almost the same height as the stock bowl. then after a good prep with 220 grit I molded it all in with bondo and some paint. I can only tell you that this sounds off when you hit it. It roars. Hope you like it.