1991 964 Turbo - Making weird noise. Youtube video attached
 

Hey guys and any girls that are on this forum. I have owned my BLK/BLK 911 Turbo 1991 for 2 years now, without any problems! I just hit 46,000 miles. The car has been more reliable than any other car I have ever owned. I haven't driven the car in a week. I took it out and added 3 quarts of oil to the car (maybe a qt. too much.) I also just filled the car with gas. I took it for a small FUN ride and right as I am about to park it it makes a awful sound.

Can anyone tell what it is? This is not the typical clicking sound that the car makes when at idle. You can really tell how pronounced it is at the end of the video when I accelerate and turn the car off.

Youtube: Porsche problem - YouTube

Doctors out there, please do not hold back. Give me your best guess diagnosis!

Thank you,