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To answer your question in an honest manner, there are several things you can do to improve the drivability, and response of the motor without too much $$. I really like the replacement Weltermeister throttle cam (it improves throttle response, and livens the car up a bit). I also have a "Wilks" computer chip in my 85 944 N/A, and it made a world of difference in the smoothness, revability, and top end performance of my stock motor. I also have a full stainless "Magnaflow" exhaust system on my car, which gives it a small boost, but also makes it sound SO MUCH better.
There is no one modification that can be done to get 50 HP without going crazy.
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