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Guys sport plus was not developed to give more exhaust sound.
Mine X5 has sport plus and I notice the difference.
Sport+ in auto mode keeps your revs and gear at a position for max power output for your current speed and throttle position.
You can also configure sport+ to have either the drive train or chassis or both tightened.
Which means the electric steering and suspension can be stiffer.
Manual mode keeps your rpm at the optimal level for the current gear you're in.
Sport+ also provides the most sensitive throttle response causing the revs go up faster than any other mode with the same pressure on the gas pedal.
For instance in eco mode you can press the gas pedal half way down and revs will go up slow and the gears will shift at a low rpm to save the most amount of gas.
In sport+ when you press the gas half way down, the rpm goes up a lot faster and gears shift at the optimal rpm for the next gear.
Also, if you're cruising in sport+ mode at a low rpm in 7th gear for example, then you floor the gas holding it there, pressing down shift once will automatically down shift to the optimal gear and rpm for Max output. So you don't have to search for the right gear for Max rpm at your current speed.
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