Thats weird I could only see two cats in my system, unless (see pic) that tiny pipe with a oxygen plug on top is the one of the second set of cats. There definitely no cats intergrated with the headers. If not I guess an possible explaination would be although my is classified as 2000 model but it actually was built in 99 (as what it says on the built plate).
Any more info on the maxspeed motorsports headers you mentioned?
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