which were introduced in the 2008 upgrade, added climate control and 6-CD autochanger to the TS specification. The 2007 model also includes less visible mechanical changes. The keyless entry system was improved. Reinforcements to the body shell improve overall chassis rigidity. The front dampers of the MacPherson strut suspension have been re-tuned to quicken steering response and reduce understeer. The hydraulic dampers of the multi-link rear suspension were also re-tuned to match the front suspension changes. Mazda engineers and designers addressed concerns regarding cabin noise level by redesigning or changing multiple systems and adding sound-deadening material to the roof lining and hood panel. The bumper-to-bumper warranty was reduced to 36 months / 36,000 miles while the powertrain warranty was increased to 60 months / 60,000 miles in most markets. In the UK, all Mazda3s have a 3-year unlimited mileage warranty, 3-year roadside assistance and 12 year anti perforation warranty as standard. Canadian Mazda3s received standard seat-mounted side-airbags and body-shell-mounted side-curtain airbags across the model range. Previously, both airbag types were not available. 2008 An additional trim level included the Sport GX with a 2.0 L engine, previously all Sport hatchbacks had a 2.3 L engine and came only in GS or GT trims. Compared to the GX sedan, the GX hatchback has body-coloured door handles, and fog lamps. Options for the Sport GX include air conditioning, a convenience package containing power accessories and 15-inch alloys, and a rear trunk spoiler. The GS sedan received standard 16-inch alloy wheels, previously only available with the moonroof option, while the GX had 15-inch alloy wheels added to the convenience package (which includes steering-wheel mounted audio controls, power windows, power locks, and remote entry). The GS hatchback now comes with factory-installed air conditioning. GT models received standard xenon headlights, previously part of the leather package. In the U.S., the i Touring trim level was replaced by the i Touring Value model. This new model added a body-color front grille, fog lights and 17" alloy wheels, giving it a very similar appearance to the more expensive s models. The interior also received leather-covered steering wheel and shift knob from the s model. Anti-lock brakes and side-impact airbags, previously optional, were now standard. 2009 Initial news reports indicated the 2009 model year would receive a minor facelift by the end of the year with exterior design modifications that included chrome door handles, a new roof spoiler,