For the surging at idle, right? What about the noise from the gas filler? Also, I changed the AOS 20k miles ago. I find it hard to believe it's dead already.
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Lapis Blue 03 Boxster S
Seal Grey 04 Boxster S (RIP 9-21-14)
You could always do what I did , shoot a lot of guns and work in construction for 30 some years without hearing protection. Then you won't hear those pesky noises anymore