hmm...
well, the ECU would control Fuel/Air ratios, and control the wastegate
and being chipped, im assuming that it would run a more rich mixutre, and allow for higher turbo RPM's higher in the rev range, which would cause more friction; and potentially more dangerous under top speed runs for prolonged use.
but as we know, Porsche ALWAYS leaves some room in its powerplants... but say the chip-tuning is off, and the mixture is too lean; thats where the damage would be more realistic...
basically, i think that if he's 50 or so more hp with the stock turbos, he ought to be fine; and the dealer is just out to push parts.... not to mention, most ecu's are made that they can be re-tuned on the spot, rather then have a replacement chip... im not perfectly sure on the 911 tho
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