Does anybody know what this sound is and how to fix it

 

Could be a few things. Need more info.

 

I like the loud buzzy noise. You just need to keep the car over 7000rpm to maintain the sweet sound!

 

Make a YouTube video and post the link here.

 

It will be near impossible to help without a audio or video clip of the sound, as there are different warning buzzers for different things. You'll also need to let us know when the buzzing starts. More importantly, we will need to know the year of your 7.