For all you 4 barrel carb. guys. I just installed a K & N Extreme filter on my CAV GT-40. I ordered it through Summit Racing Equipment ( 1-800-230-3030 ) or www.SummitRacing.com . I ordered the complete assembly ( code #66-3150 ). It comes with a filter element that is to tall for my 40. You guys with lowered motors may beable to use it as is. I only had about 1/8" clearance to my rear clip window. I called Summit and they sent me another filter element that is 2" high to replace the 3" high element. Its code number is ( # E-3527 ) /ubbthreads/images/graemlins/laugh.gif It is 9" in diameter and fits carbs that are 5 1/8" diameter. IMHO it looks really " COOL " and also lets air enter the carb straight down the stack which greatly increases the flow of air. I'll post some pictures of my old filter and the new K & N. JOSEPH /ubbthreads/images/graemlins/laugh.gif /ubbthreads/images/graemlins/laugh.gif /ubbthreads/images/graemlins/laugh.gif ( Have to compress them and post them later /ubbthreads/images/graemlins/mad.gif ) I have no connection with K & N or Summit.