Don't know how many of yall are interested, but here's what I did. Well.......here's what my friend Freddie did. LOL Since I am a walking retard with a grinder, I asked my friend Freddie about enlarging a slant manifold outlet. He took it out to 2 1/4" with meat left over. He said he was sure it would go to 2 1/2" but we both agreed that it might be a little thin. At 2 1/4" it still has plenty left. He did a fantastic job going way into the outlet smoothing and enlarging the whole way. Here's the finished product along with an untouched original to compare to. I don't know what gains if any, but it can't hurt plus when I upgrade to the TTI slant six exhaust, it will be a better match.