Hi there gonzo
There are a lot of foods out there to choose from. Some of the better quality foods will probably help your kitty have less stinky poopies.
I believe the following have no by-products, and some are made of meat meal that's fit for human consumption. (If this matters at all to you.
) They are in no particular order, and these are only some of the choices:
Felidae * Royal Canin * Nutro Natural Choice * Nutro Max Cat * Solid Gold * Wellness * Innova * Wysong
I personally feed my cat Nutro Natural Choice, and I don't notice stinkiness from the litterbox. Royal Canin is also a food that seems very popular. I would love to put my little guy on Solid Gold, but it's not sold in my area.
Also, if you feed your kitty less wet food, I believe it'll cut down on the stinkiness.
Hope this helps!