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Little background on what's up with the truck/exhaust: since I bought the truck 2 years ago, every so often it would give me a random 02 sensor code for somewhere between an hour to a few days, then clear itself up. No change in drivability, never bothered me. Fast forward to 6 months ago, I have the truck up in the air investigating a "loose heat shield" that I'd hear clanking occasionally over bumps with the windows down. Turned out to be my exhaust that had rusted in half, the backside was pivoting on the hanger and bouncing on the rear end. So I figured that was the O2 sensor code from the terrible exhaust leak. Anyway, I pulled that part of the exhaust off and have been cruising around with one half my exhaust dumped right after the muffler since, with intentions of buying a new exhaust sometime soon. Fast forward to about a month ago. Been distracted and still haven't bought an exhaust. I had to drive through some high water because it floods like a mofo here in Houston, truck is my DD. Not right away, but a few weeks later my CEL came back on and I figured it was the same, but after some driving I could tell I was down on power a little bit. Sometime when using more than half throttle at about 3600 RPM you can feel it return all the power. So I read the codes and now I have basically every O2 Sensor code... P0131, 0137, 0151, 0157 (twice, each bank) and P0101. Did some searching on what others did to try to fix...pulled/cleaned air filter, MAF, and TB, no difference. Nothing but the air filter was particularly dirty at all, in fact they were so clean I'm rather suspicious this isn't the original motor with almost 150K miles on it. Cleaned it anyway though. So, basically. I still have all these codes, my truck has quite a bit of rust underneath (most of it's life was in the north), so I'm fairly convinced it's further rusting/exhaust leaks in the (magnaflow maybe?) exhaust that came on the truck when I bought it. Although the MAF code (0101) has me worried it could be more than exhaust...? Curious what yall think, is there something else I can try? I'm going to replace the exhaust regardless, is it worth it to try and reuse the O2 sensors? I don't really wanna replace 4 (6?) at 50-100/pop Also, any recommendations on a quiet, deep toned exhaust with dual exits (not a two pronged tip) either before or after the rear tire? I'm unsure if I need mid-pipes...would rather go catless if mine are damaged, but will pay for them if deletes are going to be raspy regardless of exhaust choice. Praying I don't have to do headers too. I'd rather save my money for my project car not my DD. This thing drinks enough 93 as it is. Sure do love it though! Sorry for the novel ^