It'd certainly be interesting if drivers were forced to use the same engine mode for qualifying and the race. (wtf1.com)
The various engine modes, which can be selected at the push of a button, include changes to the sound emitted by the exhaust system. (press.bmwgroup.com)
To reduce this tendency, several testers found that opting for «efficient» engine mode gave improved traction, though at the expense of response. (motoring.com.au)