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I don't see how you could get 300 dynoed ponies with a 2.5L(or even a 2.7L for that matter).
Randall(board member) has a header and exhaust set up that got him +15lbs & +10hp at the wheels. That could be a start.
BUT,the only power mod that everyone seems 100% satisfied with is a 3.4L conversion.
When you start to add stuff up
exhaust $500+
headers $150+
cats $500+
ecu tuning $800+
supercharger $3000+
intake system $300+
at least $5k right there not installed. Your better off sticking with an early 3.4L engine. OEM reliability, 996 power and documented on several boards.
Good Luck!
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house 
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