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Here's where I am now. I've replaced the back two converters and the mass air flow sensor. The code it's setting right now is P2227. The problem is that usually has something to do with the EGR, but that doesn't affect performance, and mine is definitely affected. So, now it seems to be a try...

It is an 03. I took it to a local mechanic I trust because my experience with the dealers hasn't been all that great. The muffler shop I took it to said he could deal with the back two converters, but not the two bolted to the manifold. Those are the ones that will get expensive. I'm just trying...

My 6 has 189,000 miles, and I've loved every one of them. However, I'm currently having issues. There are 4 codes showing; P0421 warm up catalyst below threshold (bank 1), P031 warm up catalyst below threshold (bank 2), P2227 barometric pressure CKT range/performance, and P0455 evap system leak...