Hi JHP, this exhaust valve is very common on sports motorcycles and it is sometimes explained to be a method of altering the exhaust back pressure giving optimum power or fuel efficiency or both through the rev range and is controlled by the engines ECU. How it's used in the E-Pace I've no idea.
On My Honda fireblade I have same valve, its closed at low rev's , i have been informed this help assist passing noise emission rules, above a certain revs or speed it opens, cant remember exact , making lovely proper 1000cc bike sound...
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