Look here!!
Magna Port does do auto pistols. They Port the slide and barrel.
http://www.proport.com/index.html
Like Tamara said, You can have it done to a federal barrel and keep your non ported barrel for your gun and have both!! Swaping barrels will just leave non-functional ports in the slide with a regular barrel.
I have a G20c (10mm) Glock that is factory ported and I love it. Most of the crap you hear about porting is Just That "Crap!!"
The only truth to it is a noise increase and it could burn you if the ports were pressed against the skin.
I guess that could happen if wrestling for a gun, but it would also be bad for the BG if he had his hand there trying to take it away from you!
Muzzle flash is BS and is likely a carry over from competition guns that are extremely modified. Most good defense ammo will not blind you any more than a non-ported gun will.
The big question is would it be worth it for you? I feel it is a great option on a 10mm and recommend it! It recoils less than a .40SW and a bit more than a 9mm. It is great for follow up shots and reduces muzzle flip considerably in my 10mm.
Many say you don't need it on smaller calibers. I think if you want the faster follow ups and less recoil, get it done.
It is more noticeable on larger calibers, but it helps all guns. You can get or Keep the regular barrel for it if you need one in non-comp!
Just my opinion!!