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2009 ACURA TSX TO OFFER NEW XM NAVWEATHER SERVICE

First Real-Time, Weather Tracking System for In-Dash Automotive GPS Navigation Systems Featured in all-new Acura TSX at 2008 New York International Auto Show

NEW YORK, March 19, 2008 /PRNewswire/ — XM (NASDAQ: XMSR) announced that XM NavWeather, the first in-vehicle real-time weather tracking service for navigation, will be available on the all-new second-generation Acura TSX sports sedan. The vehicle was unveiled today at the 2008 New York International Auto Show at the Jacob K. Javits Center.

2009 TSX drivers will be first to experience the new XM NavWeather service, available as part of the Technology Package that also includes an Acura Navigation System with Voice Recognition™ and AcuraLink® real-time traffic powered by XM NavTaffic. The 2009 TSX will also offer XM® Radio, which features 170 channels of audio entertainment.

The XM NavWeather service uses sophisticated Threat Matrix™ technology to track nationwide weather information for more than 20 different weather conditions, then scales and customizes this detail to the driver's specific location and route. XM NavWeather can alert drivers to severe conditions before they drive into them. The service works with the Navigation System to display information via color weather icons or warning signals on the vehicle's navigation screen, and can give the driver the option to easily re-route around a storm's path. The service also provides multi-day forecasts based on weather monitoring stations across the United States.

"XM NavWeather is the only service that utilizes Threat Matrix technology to provide drivers with an enormous amount of information about the weather conditions that could potentially impact their journey," said Steve Cook, executive vice president, Automotive, XM Satellite Radio. "Acura drivers will soon find our real-time weather service a convenience impossible to live without."

"Acura is a leader in developing the latest in customer relevant technologies that advance the driving experience," said Dick Colliver, executive vice president, Acura sales. "The real-time weather system debuting on the all-new 2009 Acura TSX further connects the driver to the world around them, allowing them to get where they need to go more quickly, safely and efficiently."

XM NavWeather was developed with Baron Services and utilizes Baron's exclusive Threat Matrix technology. Baron Services is also XM's weather partner for its award-winning XM WX Satellite Weather, a trusted information source for professional pilots and mariners. XM NavWeather builds upon the success of this professional grade service by providing a "driver friendly" interpretation of the dynamic weather data direct to the vehicle's navigation screen.

XM NavTraffic, the nation's leading real- time traffic service powered by NAVTEQ Traffic, offers comprehensive traffic data for select major metropolitan markets to ensure the driver has detailed, real-time information at his or her fingertips. XM NavTraffic is also included in the Acura Navigation System as part of the Technology Package, and offers Traffic Rerouting with dynamic route guidance to help navigate around slow-downs.

The 2009 Acura TSX will be in the XM® display, March 19-20, at the New York International Auto Show.

For more information on XM NavWeather, visit http://www.xmradio.com/navweather.

About XM

XM (Nasdaq: XMSR) is America's number one satellite radio company with more than 9 million subscribers. Broadcasting live daily from studios in Washington, DC, New York City, Chicago, Nashville, Toronto and Montreal, XM's 2008 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, Ferrari, Subaru, Suzuki and Toyota is available in 140 different vehicle models for 2008. XM's industry-leading products are available at consumer electronics retailers nationwide. XM programming is also available through XM Radio Online, the exclusive home on the Internet for XM's commercial-free music channels; as downloads of original XM shows via podcasts from XM's Web site or the Apple's iTunes Store; and as streams of commercial- free XM music channels to AT&T and Alltel wireless customers through XM Radio Mobile. For more information about XM hardware, programming and partnerships, please visit http://www.xmradio.com/.

About Acura

Acura offers a full line of technologically advanced performance luxury vehicles through a network of 268 dealers within the United States. The Acura lineup features five distinctive models including the RL luxury performance sedan, the TL performance luxury sedan, the TSX sports sedan, the turbocharged RDX luxury crossover SUV and the award-winning MDX luxury sport utility vehicle. For additional information about Acura vehicles, please visit www.acura.com. For media inquiries, please visit www.acuranews.com.

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 2-28-08. Copies of the filing are available upon request from XM Radio's Investor Relations Department. Programming is subject to change.