View Full Version : blowthrough help

12-17-2008, 05:27 PM
so im doing a blowthrough in my 93 silverado i just got and i dont know how to design it cause its only for one 18 i've seen them for multiple subs.and they are facing each other with the port at the back.and normally like a 15x15 hole. but 18" plus the port would have to be at least like 28" wide just guestimating that.but i dont wanna do that big of a hole i probably will anyways but i just dont know how and how do i seal the box to the bed im stuck on that to,i dont wanna cut that much i wanna make it as small as i can with the best results