Hello, My name is George, and I just brought the 2008 (Demo) Xenon XLR home last week. I have wanted this BLUE car for a number of years, and now it's a reality. Just now learning about all the buttons and functions within the ****pit controls. "I'm actually reading the manual". Former GM Delco Moraine Proving Grounds test engineer, and long time Cadillac owner. Currently driving, this XLR, a 2005 ESV (original owner), a 1995 Suburban (oo), 1979 crew cab dually (oo), a 1976 C20 (oo), a 1972 Vette (oo), and a 1955 Pontiac (project car found in the desert, not running) Did I mention we like GM products? HA HA! I do have a TECH question on rear end 'sounds'. Thank you.