Good luck on your re-search!
I think you will find the Porsches in general (non-turbod that is) not especially receptive to aftermarket add ons. GHL, Fabspeed, B&B are some exhaust folks to check out. I am sure someone does ECU flashes, but was never interested in finding out. Most will claim the Boxster is more about Balance and Handling than straight line speed. Maybe you get a 10% boost when all is said and done, but is won't be cheap.
You may even find that a $3K 996 motor is a cheaper, more effective upgrade than anything else.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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