Can someone tell me what happens with the exhaust sound when you switch to the sport plus mode. I believe the exhaust sounds more pronounced, but I can't find a valve on the muffler that would explain the sound difference over the normal and sport modes.

 

No valve and no change to the exhaust. Only thing you're hearing is a higher revving engine if the car is being driven in auto. Otherwise no difference.

 

Check to make sure the ASC **** is turned on or off. It may be the ASC you are hearing if you have the volume turned up.