HI... I'm Jaime.. and I need exhaust

that all sounds like way too much trouble for what it's worth. All I want is some nice sound and just a bit of a performance boost. I'm not gonna race this car ... LOL

if you dont want to chance that the rear o2 will not throw a code you will have to get a stock replacement if anything at all......or leave the stock one in. otherwise just get mufflers that flow more freely. Leave the res. alone though.

i have a high flow cat and my code pops up every so often, but not often enough for me to care.

Welcome to the club