Single exhaust and cats

[C.I.Blazer]

Getting so close to starting up I can't stand it! I am waiting for my radiator to arrive and thought while I had a break I would tow the truck up to the exhaust shop and get that done.

My goal with the truck (6.0 swap into a 1971 Blazer) is to have a good solid daily driver. This will be my primary driver although I have a work vehicle and we generally take my wife's car when we go out together so it will not get a ton of miles. I am not worried about a ton of horsepower; I think the upgrade to the LS will be plenty. I do not car about the sound. In fact quite the opposite, I want to it to be quiet and comfortable to drive around.

Local shop recommended I go with a stock-ish system with a Y-Pipe into a single 3" exhaust. They also recommended keeping the Catalytic converters for cleaner burning and reduced gas smell. I still have the cats from the donor so thinking about using those if they are in good shape.

Anyone go with a Y-pipe and single exhaust? Anyone keep their cats? I am using a PSI harness and will not have rear 02 sensors. The PCM has already been programmed to delete them. Does that matter? I know they are used to determine if the cats are working efficiently. Can I run cats without them?

Thanks for the help!