I have been 'hearing/feeling' a little rattle in the frontend of my 2008 XLR since I drove it home. I purchased it as a 'demo' from a new Cad dealer. I was told 'his wife drove it' all 7K miles that were on it. I bought the car in March of 2009, and had it '4 wheel aligned' back in Jan of 2010. I asked the alignment shop to 'look for something in the frontend that would "rattle". They found nothing at that time. The car has been to my local GM dealer for 6 + oil changes and services, without any indication of a problem that might cause MY RATTLE. I was cleaning 'her' up a little and noticed a 'black bracket, with a silver area showing in it'. I took a better look, and right away. OMFG !! The entire core support is HANGING DOWN and is about to fall out of the car ! There are two 'hoops' that attach to the frame rails with brackets, and they hold up the core support. Aluminum is the material that the 'hoops' and the brackets are made of. These 'hoops' act as "skis" or "skids" when you strike a parking stopper or the curb. I don't (never have) struck anything with this car and my wife didn't either (I do believe her REALLY !) SO, I am thinking that the IMPACTS that caused this damage were done BEFORE I bought the car. Makes no difference now, but I can help anyone who requires input on how to completely remove and replace the entire front end on these cars, without doing any paint damage. WITH SIMPLE TOOLS. I put the car on a lift, removed the headlights, air dam, grill/bumper (as one unit), and then TIG welded the damaged brackets and then reassembled the entire mess back together. It took me 4.5 hours on my first (and only !!!) try. The entire assembly was 3/4" down and 3/8" forward, due to the bending of the front vertical portion of the 'hoops' on both sides. IF any of you 'feel a rattle' or just don't know what 'feels different' PLEASE look at the front of your car while it's up on a lift. LOOK AT IT YOURSELF !!! Everything on my car is UNDER WARRANTY EXCEPT IT'S GUTS FALLING OUT DUE TO IMPACT. "Thank GOD I'm a nosy SOB !"