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I would find out how long it was driven with the bad AOS. That can muck up the converters if ran that way long enough. Replacing the cats is not a cheap fix, spark plugs are though.
I'd worry about the "candidate for retrofit" as to what they meant. If they meant the IMS is at a failing stage then you better get that replaced asap. If it goes, you're looking at a engine rebuild or installing another engine.
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2003 Boxster S
| 987 Air Box | K&N Air Filter | 76mm Intake Pipe| 996 76mm TB | 997 Distribution T | Secondary Cat Delete Pipes | Borla Muffler | NHP 200 Cell Exhaust Headers |
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