NEWS RELEASE

XM and General Motors Launch Satellite Radio Program for GM Certified Used Vehicles, Cadillac and HUMMER Certified Pre-Owned Vehicles

5/23/2007

MORE THAN 115,000 XM-EQUIPPED CERTIFIED GM VEHICLES PROJECTED TO BE SOLD IN 2007, INCREASING TO 168,000 FOR 2008

WASHINGTON, May 23 /PRNewswire-FirstCall/ -- XM (NASDAQ: XMSR), the nation's leading satellite radio service, and General Motors Corp. today launched a satellite radio trial program for GM Certified Used Vehicles, Cadillac Certified Pre-Owned Vehicles, and HUMMER Certified Pre-Owned Vehicles, now making the XM trial program available to buyers of both new and certified used models. XM will be available in more than 115,000 of these certified GM vehicles in 2007, and grow to more than 168,000 vehicles in 2008.

(Logo: http://www.newscom.com/cgi-bin/prnh/20070313/XMLOGO )

Under this program, all GM Certified Used Vehicles (Chevrolet, Pontiac, Buick, GMC, Oldsmobile models), Cadillac and HUMMER Certified Pre-Owned Vehicles equipped with XM Radio will be available with three trial months of XM service and a waived activation fee. A list of previous model year Chevrolet, Pontiac, Buick, GMC, Oldsmobile, Cadillac and HUMMER vehicles factory-equipped with XM can be found online at http://www.xmradio.com/whatisxm/inyourvehicle/used-vehicles.xmc.

GM is the nation's largest automaker and the industry leader in manufacturer-certified used vehicle sales, representing nearly one-third of the volume of all certified used vehicles sold in the U.S. GM Certified Used Vehicles has been the top-selling certified used vehicle brand each of the last five years, according to Autodata Corp.

1 "GM is XM's largest automotive partner and XM looks forward to providing premier entertainment to this important and growing segment of pre-owned vehicle customers," said Marisa Uchin, director of remarketing and automotive strategy, XM. "Now customers who purchase a certified GM used vehicle from Chevrolet, Pontiac, Buick, GMC, Oldsmobile, Cadillac or HUMMER have the opportunity to conveniently experience XM's 170-plus channels of music, talk, sports and entertainment, adding to the exceptional driving experience customers come to expect when purchasing a certified used vehicle."

"Over the last five years, XM has been featured in millions of GM vehicles," said Paul Pejza, manager, GM Certified Used Vehicles. "It is only natural that we launch this program to provide GM Certified Used Vehicles customers an even more compelling value."

GM Certified Used Vehicles, the number-one selling manufacturer-certified brand, are high-quality, reconditioned vehicles, available at participating Buick, Chevrolet, Pontiac and GMC dealers. All models are six years old or newer, have 60,000 miles or less, are reconditioned to stringent GM Certified Used Vehicles standards and must undergo a rigorous 117-point inspection and reconditioning process. All GM Certified Used Vehicles are supported by a fully transferable 5-year, 100,000-mile powertrain limited warranty with no deductible*, three-month/3,000-mile comprehensive bumper-to-bumper warranty, a three-day/150-mile customer satisfaction guarantee, and 24-hour roadside assistance during the term of the warranty. For more information about GM Certified Used Vehicles, visit http://www.gmcertified.com/.

Cadillac Certified Pre-Owned Vehicles come with a 6-year/100,000-mile powertrain limited warranty; and Hummer Certified Pre-Owned Vehicles come with a bumper to bumper 6-year/100,000 mile warranty. For a previously owned HUMMER to become a Certified Pre-Owned Vehicle it is tested to meet HUMMER's stringent standards and undergoes a rigorous 100+ point inspection. In addition, vehicles must be less than 48 months old, driven fewer than 50,000 miles with no serious accidents or body repairs.

About XM

XM (NASDAQ: XMSR) is America's number one satellite radio company with more than 8 million subscribers. Broadcasting live daily from studios in Washington, DC, New York City, Chicago the Country Music Hall of Fame in Nashville, Toronto and Montreal, XM's 2007 lineup includes more than 170 digital channels of choice from coast to coast: commercial-free music, premier sports, news, talk radio, comedy, children's and entertainment programming; and the most advanced traffic and weather information.

XM, the leader in satellite-delivered entertainment and data services for the automobile market through partnerships with General Motors, Honda, Hyundai, Nissan, Porsche, Subaru, Suzuki and Toyota, is available in 140

2 different vehicle models for 2007. XM's industry-leading products are available at consumer electronics retailers nationwide. For more information about XM hardware, programming and partnerships, please visit http://www.xmradio.com/.

About General Motors Corp.

General Motors Corp. (NYSE: GM), the world's largest automaker, has been the global industry sales leader for 76 years. Founded in 1908, GM today employs about 280,000 people around the world. With global headquarters in Detroit, GM manufactures its cars and trucks in 33 countries. In 2006, nearly 9.1 million GM cars and trucks were sold globally under the following brands: Buick, Cadillac, Chevrolet, GMC, GM Daewoo, Holden, HUMMER, Opel, Pontiac, Saab, Saturn and Vauxhall. GM's OnStar subsidiary is the industry leader in vehicle safety, security and information services. More information on GM can be found at http://www.gm.com/.

* Whichever comes first, from original in-service date.

Factors that could cause actual results to differ materially from those in the forward-looking statements in this press release include demand for XM Satellite Radio's service, the Company's dependence on technology and third party vendors, its potential need for additional financing, as well as other risks described in XM Satellite Radio Holdings Inc.'s Form 10-K filed with the Securities and Exchange Commission on 3-3-06. Copies of the filing are available upon request from XM Radio's Investor Relations Department.

Photo: NewsCom: http://www.newscom.com/cgi-bin/prnh/20070313/XMLOGO AP Archive: http://photoarchive.ap.org/ PRN Photo Desk, [email protected] SOURCE: XM Satellite Radio

CONTACT: Chance Patterson, +1-202-380-4318, [email protected], or Marie Farrar, +1-202-380-4151, [email protected], both of XM Satellite Radio

Web site: http://www.xmradio.com/ http://www.gm.com/

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