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I checked into this a while back. the 02+ get a bump (250 to 258) over the earlier cars from better heads and cams (improved variocam) and tune. the 04 anniversary gets the 987 airbox and an even better tune for another bump (258 to 266). Porsche claims that the pse doesn't add hp, just sound.
the 987 has the same 3.2 in it and makes 276 - how's that done? the 3.2 never got variocam plus.
*** edit - a quick look at the parts diagrams shows that the 987 3.2 is running the same heads and bottom end. only change looks to be exhaust and potentially better tune. So, use guys with early cars *should* be able to get 18 factory hp w factory airbox, factory exhaust (987 exhaust bolts right in and is smog friendly) and factory (or equivalent) tune. for comparison, 268 hp / 3.2 litres = 83.8 hp/litre. the 996 makes 86.8 hp/litre (295 hp 996.1 3.4 litre engine). so, still some room to improve (potential for 10 additional hp to 278 hp if same ratio applies). 996 has longer intake runners that will bolt onto a 986 head with just a bit of work - perhaps that is the last piece.
Last edited by The Radium King; 01-19-2016 at 09:20 AM.
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