what size bellow?
what size bellow? 
i did the ferco mod , makes it tough to get the air lid on, even more so when you get an aftermarket air lid, i fear breaking the rear tabs off my lid. I am fixin to replace mine with an actual smooth bellow. but yeah , 3 inch.
I bought a 3" fernco and I dont understand why everybody is scared of breaking something?? It slips nicely over the tb, and also slips over the maf housing? I'm using a granatelli maf housing if that makes a difference and a SLP lid? Just remember to trim the inside of the bellow to make it fit perfect. but its one of those mods that makes you wonder if you just wasted your time by putting a sewer pipe fitting on your LS1.
