Are you thinking about a flat slide pumper? Slip-ons air breathers (my 2cents) are a POS pull your seat off, and with the mach running give it some hard gas. You'll see the air box moving in and out. Smaller/Larger thats what a tune air box should do. Look at the ribs on the intake tube when your gasing it. Yea they are moving. Thats why they are there. If you want to put on a slip-on you still can. Hell it's not my mach. And yes you can add extra holes in the box and it still moves in and out. How many or how big? That up to you, I was thinking about putting a K&N type of slip-on thur Summit. For a camaro/firebird that would work and jet right. But at 204.95 I'm not rich, part num KNN-57-3022 or KNN-57-3020. Sorry for the long post. I'm sure to get Sh*t on this but like I said it's my (2 cents)
later