I'm rebuilding a 85 full size bronco with a 5.0 EFI motor with a dual port throttle body. I've been lookin into dumpin the old air filter sys. for a cold air intake sys.. But my problem lies in that none of the manufactures build one for this year. Has any one custom built one and are there any tips you could provide. Or would you even recommend that the old filter sys. be dumped.