I had an annoying "clunk" and a rattle that would occur at random times over bumps that I finally found. You could tell it was coming from the rear. I had to tighten the nut on the spare tire jack that holds it all down. I tightened it about 20 turns!

Hope this helps someone,

 

thanks I'll have to check mine

 

Awesome thanks for posting I was also getting that noise, only sometimes and I have not had the time to track it down.

 

I'll have to check because I do have a rattle or something from towards the rear I've been trying to find.

 

crank the radio and change your exhaust you wont hear anything else, including girlfriends, wifes, and fiancees

 

I'll have to look into this as well, have one that's been driving me NUTS despite checking torque on all fasteners in the rear suspension!

Edit: That cured it, I put the jack in backwards and not tight enough after my last track day...won't make that mistake again!

 

I've gotten used to some rattles accept for one that I'm going to the dealer for on Monday. I just took all of the crap out of my trunk today anyways. Good info though!