The pictures from ktwm of the ejection port modification were probably lost when Kel-Tec forgot to pay for their domain registration, some domain squatter grabbed it and they had to change to the new kel-tec-cnc.com address. The pictures of my modified SU-22 ejection port are still available.
If your SU-22 serial number is less than 100, you might not have the factory modified ejection port. You can easily see if Kel-Tec milled a shiny angled cut on the lower lip of the ejection port, which is the part I sanded into an organic looking rounded surface, as seen in my pictures. If your SU-22 has the lower ejection port as molded, you can sand it to look like mine. It's quick and easy to do.
The other modification Kel-Tec has made is a shallower feed ramp. I didn't do that modification on mine. I didnt polish the feed ramp either, although several thousand rounds apparently did a good job of polishing it. A couple of weekends ago, I accidentally ran a magazine full of Remington Golden Bullet ammo through my SU-22 and had no problems. It would jam almost every time on that ammo when new. In a previous thread, ktwm told me that the SU-22 would be less ammo sensitive after an extensive break-in period, and apparently he was correct.