I've seen that UR ported their stock exh manifold (maybe O2 and turbine housing?).
I pulled mine apart to do all the above. I see alot of oportunity for increased flow. Port matching both ends of the exh manifold, port matching turbine housing, polishing turbine outlet and porting and polishing the O2 housing. Some light polishing in the compressor outlet.
I know they have been doing this on DSMs for years.
Has anybody done this or know why we shouldn't?
I'll attach some pics in 5 mins.

 

I did this on my Eclipse when I got my big 16-G, and was wondering the same thing with the Evo, curious also...

 

Turbine outlet, note carbon. This is where it can be ported, anlong with polishing the outlets.

 

O2 housing, same carbon area.

 

Manifold, block side. More small ports.

 

Turbo side of manifold, with gasket in place. See how much can be cleaned up.

 

Turbine housing inlet, with gasket. Again, more porting potential.

 

looks like you got alot of work ahead of you...I take it that the Evo's not your daily driver then :-)

 

On the contrary..I drive it everyday. I just happen to have a week nfor it to be down while my wife's out of town. I can drive her SRT-4. Big draw back; she has presonal plates that say "GA GIRL", (georgia girl for idiots that say "what's (Gah) girl?"
It's still fun to drive.

 

"plates that say "GA GIRL", lol.........sorry but thats funny. Cool best time to do it.....when you have the time.

 

Your right man there a good amount that can be smoothed out for sure! Good job on taking the time to post this. I know what I will be doing my next week off!! What are you going to do it with? Way too big a job for the dremmel (for you scoobie guys were a dremmel is the "only" tool you need )

 

I've got a die grinder and stone wheels, I just need some cartrige rolls and cross buffs. I've never done this so I will error on the conservative side. I'll match the ports, clean up the flash and sharp edges, and polish what I can. I'd sure like some tips if anybody is experienced in this.

 

Hmmm, I used carbide grinders......but stone will work too, its going to eat up your stone before you do any real grinding of metal. Nice smooth strokes, keeping it even is the key, wear a dust mask if you got one and safety glasses, the little metal shavings get EVERYwhere. Let me see if I can find a pic of what type of insert I used to do mine......(BTW im a machinist and work on metal all day)

 

Yea post pics and try to do an after dyno to see how it changes the cars feel.
don't do any other mods to to the car to see if how just this affects the car, thankx.

 

Here is a page of a whole bunch of them, scroll down......http://www.tools-plus.com/makgeo600.html I'll post a pic in a few minutes.