porting 2-pc EM, and other mods

[Ken Keith]

Hello Audifans,

I've got a 2-pc exhaust manifold on the way, and I was wondering if I
should tweak it before it put it on.

I'm not very concerned about cracking or warpage with this unit, so I'm
not thinking I'll spend money on having it cryo treated.  I suppose I could
go this way too, since now will be the chance, and it supposedly
increases the strength and stability of the part.

I think ceramic/JetHot coating might be a good idea.  I live in central AZ,
where it gets hot in the summer.  Underhood temps are going to need to
be controlled, and I think it's better for peformance to keep the heat in.

What about porting, or modifying the shape of the internal fins at the
end where the turbo bolts on?  I believe there is a piece of "webbing" or
a wall between two passages that abruptly comes to an end at the
flange.  I seem to recall someone sharpened that edge to make the flow
smoother.

I don't want to eliminate any potential anti-reversion lips by match
porting it.  I guess since this is receiving gas from the head, then there's
no way to decrease the anti-reversion lips by messing with the EM.

Should I bother going through it and smoothing things out?  I imagine
there might be some casting flash or something.

Basically, I'm wondering what the drawbacks or negatives to trying this
are?  A concern might be that by removing material, I might make it
weaker or more susceptible to cracking or something.

Thanks,

Ken