Performance Points, Engine Mods versus Bolt Ons

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What gives more horsepower per performance point, Engine Mods (stage 1-3) or bolt on mods (intake, exhaust, chip, turbo)?
 
What gives more horsepower per performance point, Engine Mods (stage 1-3) or bolt on mods (intake, exhaust, chip, turbo)?
Depends on the car.
 
Tried a few different things for my two 500pp cars:

Fairlady Z (Z34) '08: 410 horsepower 424 ft/lb torque. Stock weight. No Aero.
Bought all engine upgrades, bolt-ons, and supercharger. Detuned engine output to 500pp. This yielded 1:29.5 on trial mountain. I tried various versions of this car, purchasing 2 extra car's for comparison between different engine stages. It seemed like maxing this particular car out AND adding the supercharger is better than one or two engine stages, no supercharger, or stock motor and supercharger, or stock motor and full boltons, etc etc. This is because the car really benefits from the torque improvement (stock 270 ft/lb boosted to 424 ft/lb improvement!)

Nissan GT-R '07: 390 horsepower 520 ft/lb torque (iirc). Stock weight. No Aero.
Bought low rpm turbo (to maximize torque relative to pp amount), no other power mods, detuned engine output to 500pp. Yielded similar times as the 370z above. Car handles better and has more grip than Z but does not have as much top-end speed, can really feel this lack of power above 100 mph. Also tried GT-R without ANY power mods and detuned to 500pp. It is slower than with the low rpm turbo, even though the horsepower is greater, the added torque really hits a sweet spot for this car.

Conclusion: Both cars perform better with the engine's output surpassing horsepower allowed under 500pp then detuned to 500pp.
 
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