Re: ★ Russianred's Turbo Build Thread! ★ *UPDATED 3/4/12* ★
Nikita,
I would say at the very least trim off the excess flange at the collector, due to it may causing some turbulence in the air flow into the manifold if your going to do it yourself. Even if you don't trim it down, honestly it's not going to make that big of a difference anyway, it's just if you want to do it.
It shouldn't hurt the integrity of the manifold either way, but may help the air flow slightly if your up to it. Seeing a sneak peek of the welds seems to be a decent manifold for $100, nice find.
Looks like you are making some good progress. Keep it up!