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FWIW ....I don't have dyno stuff.. but the seat-o-meter says it pulls stronger and longer, the local Porsche center even commented on how its the hardest pulling S2 they've serviced.
I found a decent one on ebay for cheap, of course its a clone of an unknown chip, promax? steve r? But it works, and it works well. Haven't tested the rev limiter yet.
I believe mine is a steve r but couldn't tell you as it was in there when I bought the car. I can't compair it to stock...but at least you know it's out there.