Ok, now I know. It was pretty easy to do, cut open, drop catalyst, weld shut. Welding was difficult because material is some kind of stainless, had to weld it with normal steel mig. Exhaust sounds perfect now, little bit more raw and louder, like it a lot. No drone or raspy at all. Catalyst was very good condition inside, no cracks or melting. Biggest surprise was difference in performace, I did`t expect any gains. Car pulls MUCH more freely and is quicker to pick up revs. 4th gear is where you can really feel it. Lot more torque 2000-3000rpm in any gear. 6th gear cruising is easy, barely need to touch accelerator. I think it will get better MPG. I highly recommend to do this. I have some pictures also. Sorry for rusty english.