Quiz: Guess the most outrageous car part price!

We heard some great answers to our last question, Which vehicle has one of the most expensive regular maintenance services? They included an oil change on a Ferrari Enzo and any service for a Bugatti Veyron. If you've had any of these services performed, please let us know how much you paid.

The answer to our last quiz, which no one came up with, is changing the spark plugs on a Mercedes MacLaren SLR. A Mercedes technician blew us away when he told us that the warranty time for this service was 25.5 hours! Our local Mercedes dealer charges $175 an hour for labor—that's $4,500 plus parts for new spark plugs.

And now it's time for this week's question. As always, you will receive loads of fame here in the RepairPal blog for answering this correctly. Good luck.

Question: What's the most expensive car part at RepairPal.com? You'll get extra points for guessing the price.