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Greg Brown uses a standard Bosch alternator stripped and put into an aluminum case that a local CNC shop makes so it will mount to the stock 928 mounting holes. That alternator suffers from the same low idle output as all Bosch alternators of that ilk. I forget the specific numbers off hand, but you're talking about under 70 amps for sure, but I think it's in the 30 amp range. You'll pay north of $1,000 for that alternator that has poor idle performance but fairly high output at higher RPM's. However, he doesn't offer an output curve with the four figure purchase, so there's no telling exactly what you're getting.
Or, go with the Ford 3G large case alternator that has very good idle output (90+ amps for the basic versions)and will cost around $200 for a brand new one with all of the fixings for ~130 to 150 maximum output. Or, go for a 200+ amp version (~110 amps at idle) with an output curve for ~$400 that will outperform the Bosch alternator by a mile. Plus, it's easy to swap in different pulleys to match your particular idle RPM and needs.
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