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Aging Oxygen Sensor

Engine

Model: Boxster S, Year:2001, Mileage:24,500, Type of use:Street use only
I have been chasing odb2 fault codes and have come to a roadblock. I have a 2001 boxster S. I bought it from the owner of a local Porsche performance shop. It had 8300 milse on it and had be slightly modified. It has an aftermarket cold air intake, an aftermarket exhaust, which sounds very cool by the way, and I think there has been a performance chip ugrade as well. The car has 24,500 miles on it now and about a year ago I started getting fault codes 1128 and 1130 which seemed to be an indication of a bad MAF sensor. I purchased a new one, the upgraded version, reset the codes and thought it was fixed. About two weeks later, I got a new code that translates to "aging post catalytic converter oxygen sensor" on both banks.I bit the bullet and order two new post cat oxygen sensors, replaced them, and about two weeks later got the same aging sensor codes. Any ideas shere to look next? It appears as though the aftermarket exhaust has 2 precat and 2 postcat sensors yet if I look at a stock parts list ther might be as many as six total oxygen sensor associated with a stock exhaust. Could this be part of the problem? Any help or advice would be greatly appreciated.

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