I would just stop in at the dealership and ask a service adviser to take a quick listen. You may be hearing an emissions device cycling on and off. If so, they will have heard this before and will explain what it happening. If they are concerned, they'll discuss your options as to when you want to bring it in.
If the service adviser is unable to identify the noise or get it handled, see the salesman that sold you the car. Their job is just starting after you drive away with your new car. They are responsible for taking care of any issues later, and they can get an appointment set up for you in the service department if that appears to be necessary.
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Thursday, August 6th, 2015 AT 2:57 PM