This mode allows the injectors to dump more fuel leaving excess fuel in the downpipe and exhaust, being hot, it ignited and makes burbles, that's why as soon as you off throttle in mid RPM range it burbles, but when you rev is very high, no burbles as the engine will not have excess fuel to burn in the exhaust as its all consumed whilst enabling a higher engine speed.
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Originally Posted by rouxeny
Still curious what exactly is happening in this mode. It is a lot louder than sport+
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