DIY exhuast manifold porting questions

I'm sure some folks here have done their own exhaust manifold porting. Do you have any pictures of your work? What tools and techniques did you use?

Die grinder, coarse carbide burr and this

http://grassrootsmotorsports.com/forum/tech-tips/make-a-honing-and-polishing-tool/75419/page1/

I use long shank carbides with a quick high grit paper to finish.

interesting subject;porting and polishing! question came up on another forum, how much increase % wise,would P/Ping a stock engine, no other mods?

it doesn't work like that.

Porting a rotary can mean a 100% increase in power.

I used a angle grinder with carbide burrs for iron, for aluminum I'd start with burrs and move to a series of sandpaper rolls, flap paddles, and sand paper.
I also got a pencil-type grinder, similar to a dremmel but air powered.