RC:
According to a guy who tunes V10 engines for a living, the current V10 engine is good for 650 hp without any major mods and/or a capacity increase. The current 610 hp V10 is even "detuned" slightly to reduce torque because of the S tronic gearbox (Audi R8 V10 Plus has 560 Nm torque and this torque is artificially limited, usually the engine would deliver over 600 Nm). So any tuner would need to increase power without torque because the gearbox can't take it. Not really a problem on a n/a engine.
Fun fact: The R8 V10 (without Plus, the 540 hp engine) has the same engine as the Plus variant, no hardware differences. No kidding. Power increase through tuning is difficult though because of various software protection routines and the different gearbox gearing ratio. Same goes to the 580 hp LP-580, it is just software, no hardware.
Also, the upcoming Huracan Superleggera (and Audi GT) will get around 630-640 hp without any major hardware mods, same engine.
I guess this shows that Lambo, Audi, and Porsche really are related 
It is a pretty cynical exercise to detune an NA motor for both power and torque (could understand it more easily with a turbo motor that reduces boost). The only easy way to reduce torque in an NA motor is simply to prevent full throttle from happening (even with the gas pedal to the floor, the e-throttle doesn't open all the way).
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16 Cayman GT4, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi
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