(Torque x Engine speed) / 5,252 = Horsepower
A4: 211 hp @ 4,300 rpm; 258 ft lb of torque @ 1,500 rpm
370z : 332 hp @ 7,000 rpm; 270 ft lb of torque @ 5,200 rpm
My guess is the turbo in the A4's sweet range in PSI is between 1500 and 4300 and tapers off after that.
My talking out my *** btw.
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