You can't view price when debating rivals, anyway everywhere else th S4 and 335i are the same price.
Also without testing the power figures of the S4 we have to believe Audi's figures and we already know that the 335 produces close to the figures quoted for the S4 both hp and torque so it's all down to the way both curve are in each car.
My guess is the S4 is stronger over more of the rev range and especially so closer to the rev limit.
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