Exhaust/cats, and pano sunroof questions and need some help

[SRP]

First off I am new to Xoutpost, I've owned my 2005 X5 4.4i for 10 years its Imola Red with some minor mods nothing serious, I am more active on m3post since I also have an e92 m3.

So now for my questions
CEL came on and found out the code was because of my cats they are probably going to fail soon so what have you guys done about this issue? I was thinking maybe removing the cats and replacing with basic pipes kind of like test pipes for the m3.

2. I wanted to remove the resonator for a little more grunt. I do not want any sort of drone in the car since my M3 does a lot of that, and also other people in the house drive the X5 and they would hate the noise. So I was thinking either doing a res delete or maybe a muffler delete.

3. I want to change the exhaust tips, obviously if I was doing a muffler delete I would have to, but if I don't do a muffler delete what are some good exhaust tips i can replace the stock ones with.

4.One of my dumb ass friends decided to open my sunroof when it was frozen over with ice during winter then i realized that now my sunroof doesn't close so i kept going to BMW to get it done manually but then they disconnected everything and i want the shade open i don't really care for the actual glass to open.