The stock exhaust manifold has a lot more material in it as long as you keep the opening centered and know what you're doing with a grinder. Which I do not. But here is what my friend Freddie did for me on one manifold and the one I have currently has been opened up to 2.5" and we feel sure there's room for 3" although that would be getting a bit thin. I'm just crappy with a hand grinder, but thankfully Freddie is a legend genius with one.
[URL]https://www.forabodiesonly.com/mopar/threads/exhaust-manifold-mod.465895/[/URL]
