The TSX is badge engineered from the CL-series Accord (also known as the European Accord or JDM Accord) sold in Europe, Japan and Australia. The TSX initially had a restyled interior and different suspension tuning than the European Accord when it was introduced, however since 2008 the interior is now standardized for all three markets. In the Australian & New Zealand, the CL-series is sold Accord Euro, a smaller mid-size car, where the USDM Accord is sold in the large car category. In North American, the TSX is sold alongside the mid-size luxury Acura TL, which itself is based on the USDM Accord, as well as the USDM Accords sold under the Honda name.
The 2008 model year TSX's powertrain was comprised of a 2.4-litre inline four-cylinder engine, a six-speed manual transmission (which featured a magnesium casing, to reduce weight), and a front wheel drive layout. A five-speed automatic transmission was optional and did not incur extra cost in the U.S. based on MSRP, however such was not the case in Canada. The TSX's suspension setup of a double wishbone front and a multi-link in the rear was especially tuned by the Honda engineers to maximize handling and cornering speed.
2005 was the second year of the TSX and Acura updated it with XM Satellite Radio, heated door mirrors, a four-way power passenger seat and illuminated the steering wheel-mounted audio and cruise controls. In 2006, the TSX was updated with slight tweaks to the engine (adding 5 hp); a sportier exterior styling featuring a slightly new front and rear treatment, standard side skirts, and standard, integral fog lights; and restyled wheels. State of the art interior features have been added, including a Multi-information Display (MID) in the instrument panel, more standard safety features, and luxury features such as an auxiliary MP3 player input and Bluetooth-compatible HandsFreeLink. In 2007, a new Tire Pressure Monitoring System and an improved electronic rear view mirror were added, and the 2008 model year brought a few additional features and a new colour to the TSX.