Quote:
Originally Posted by Fast Freddy 944
Tuned headers make a big difference.
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This is not accurate. Racers Edge managed only 7 horsepower gain on a 200 HP S2 by installing their $1600 header. That was on a twin cam, 16 valve motor with substantially better breathing than a 2.5.
Racer's Edge -- Racer's Edge 944 Header
You can expect even less gain with a 2.5, which has a decent 4-2-1 "tuned" design (drawn up by engineers at Porsche).