[blinkwatt]

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!