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just as a point of realism, typically, on a normally aspirated engine, without getting into the engine itself to do things like compression bumping, cam work, etc, you are limited to about 10% in what "bolt-on" mods can do in terms of horsepower. it is not a cumulative effect either. it is erroneous, albeit common, to think that if a header does "X", and a chip does "Y", that you can sum them up. you cannot. there is a diminishing return on these. basically the rule of thumb is that you will get 100% of the what the first mod will do, 50% of what the second mod would do if by itself, 25% of the third mod, etc.
even if you do get inside the engine, if you stay normally aspirated, you will not get past a 25% bump.
raw power is not what these cars are about. if you are looking for 0-60 times and such, you chose the wrong car. almost every sporty car out there today will outrun any 944 in a straight line, no matter what you do to its normally aspirated engine.
none of that though means that you can't enjoy the car
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