If everything is working as is my guess would be the predefined map. With the custom exhaust and modified air intake your only bet to get it right would be for someone to create a custom map on a dyno. Hard to justify the cost though.... At least in my opinion, especially if you don't track it anymore.
Your car is absolutely mint and looks and sounds great...
Heiko
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Previously owned:
2000 Boxster S 3.2 Ocean Blue / 1974 911 Targa Silver
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