Likely a problem with the exhaust mount. A lot of people have described it as a pinging noise. There's a TSB out on this, the dealer will do it under warranty, I believe they add an additional weld. Had mine taken care of about 6 months ago, no problems since.
Stacy
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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