Anyone know the size of a stock 94Z Y pipe. I'm trying to figue out what size cat I need. I believe it's 3"?

 

mac makes a replacement thats what i just installed 130 from ls1.com i think it was

 

NastyZ what year is your car? Did you get the ORP or weld in your cat? I want to get a Y-pipe for my 93. I saw the Stainless Works in Summit for $199. I have not seen anyone else use that yet. The picture does not show a ball flange for the cat-back. Was the Mac a direct fit?

Ead, I think you need a 3" cat.

 

i have a 94 i had someone install it far as i know it was a direct fit i did buy the magnaflow 3 inch high flow cat tho it fit good no welding needed i have that with a magnaflow muffler it sounds mint..