Basic exhaust information for a 5.7L

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Sideways the Seven

It's all Gravy, baby.
Joined
Dec 22, 2010
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DFW, Tx
I have a O2 CEL and rather then just replacing parts and then going back and changing the exhaust later, I am wanting to redo the exhaust on my Suburban from the engine back and I have a few questions. How well do the stock manifolds flow? Is it beneficial to keep those while replacing the cats (high-flow) and mufflers? I want headers, but I don't want them leaking and all that. I haven't decided on a muffler yet, but I'm thinking about doing side exits in front of the tires. Also, is it beneficial to replace the cats and keep the O2s where they are or should I look at just getting piping from the manifolds back (size?) throwing the cats in and having new O2 bungs welded in?
 
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