optional polished and chrome-plated wheels, in 16, 17, or 18-inch diameters. Only later base-model trucks, with the exception of the base received 16-inch steel wheels, and were a new wheel design. In addition, most newer trucks also featured standard SiriusXM satellite radio, when equipped with a CD/MP3 player. Colorado/Canyon U.S. sales peaked in 2005 at 163,204 units, surpassing the perennial segment leader, the Ford Ranger, by almost 35% and just 3.3% behind the new best-seller, the Toyota Tacoma. In 2006, however, while still leading the Ford pickup by 27.5%, Colorado/Canyon's sales lagged their Toyota competitor's by almost 34%. One 2005 Canyon owned by successful U.S. Senate candidate Scott Brown became famous as it was widely featured in his TV advertisements. Safety In the Insurance Institute for Highway Safety's frontal offset test the Colorado (extended version) is given a "Good" overall score, however the crew cab is rated "Acceptable". In the side impact test, the Colorado crew cab is rated "Poor" with or without side curtain airbags. Side curtain airbags were made standard on all 2010 models; side torso airbags are not offered. Isuzu i-series The Isuzu i-series midsized pickup truck line was manufactured from 2005 to 2008. Launched at the 2005 New York International Auto Show, for the 2006 model year, the i-series replaced the Hombre, which had been out of production since 2000. Like the Hombre, which was based on the compact Chevrolet S-10/GMC Sonoma, the i-series was based on the Chevrolet Colorado/GMC Canyon. Two models were offered at launch: the i-280, powered by the 2.8 L I4 engine, and the i-370, powered by the 3.7 L I5 engine. The i-280 was available only with an extended cab, while the i-370 could be had with either an extended cab or crew cab. The i-280 was replaced by the i-290 for 2007 with the introduction of a 2.9 L engine. The sales for the i-series were poor, with just 1,377 sold from the start of production through February 2006 according to Automotive News. As part of Isuzu's withdrawal from the United States market after the 2008 model year, the i-series was discontinued. Thailand GM Thailand manufactured the Colorado from March 2004 with a mildly altered styling compared to the North American version. In late January 2006, Chevrolet introduced a G-80 differential lock system as optional for most Colorado trim levels. This feature is not available on the D-Max. Thai-market Colorados