wow I can't believe this is even threadworthy. I like pic #2 although pic #1 has a nice quality to it.

PS you can't hear the noise outside of the car over the engine, and your passengers will not even notice it. If you are really nervous about it make sure you do a burn out every time you start the car and no one will be the wiser.

 

I'm really glad this thread was posted, I have been trying to decipher that noise and didn't know of a way to explain what it sounded like!

 

It really sound like the car is farting! Its quite embarrasing I must say.