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Emissions. You have "pre-cats" - the sensors check your exhaust gasses before and after the cat converters. I've seen them with 4, but not 5 - you must have the California emissions package....started in 2000.
What you do is, you get a "header" from Banks or JBA. They're the only ones who make an exhaust manifold for the 00-01.
I assume that the header would have the bungs mounted for the stock O2 sensors but what about the precats? Would I be in CEL hell? I'm wondering if it is even worth the pain involved. I should just keep my stock manifold and maybe put a new highflow cat and muffler.:doh:
yes, those two particular headers have the bungs for the upstream O2 sensors....as for the pre-cats, they sit below the header "flanges" (where the head pipe bolts to the header) and are part of the head pipe/down pipe.
Take a look, you'll see what i mean...
EDIT:
even better, here's a pic, you can see exactly what I mean