Although its ageless design suggests otherwise, time is far from standing still for the acclaimed Audi TT sports car, as increased power outputs for several models bring improved performance with no emissions, fuel economy or price penalties. Despite the power boosts, OTR prices ranging from £21,090 to £32,360 remain unchanged, and orders can be taken from this week.

At the entry point to the range, the popular TT Roadster now features a 163PS version of the 1.8-litre turbocharged four-cylinder engine, which replaces its original 150PS unit. The additional power reduces its 0-62mph acceleration time to 8.2 seconds and increases its maximum speed to 135mph.

Front-wheel-drive TT Coupé and quattro four-wheel-drive Coupé and Roadster models also now feature a 190PS version of the turbo unit, improving acceleration and boosting maximum speed across the board compared with the 180PS engine it replaces. The 190PS TT Coupé with manual transmission, for example, benefits from a reduced acceleration time of 7.4 seconds and a maximum speed of 145mph.

As part of a rationalisation of the TT range structure for the 2006 Model Year, 225PS versions have been phased out, leaving the TT Coupé quattro Sport with its 240PS 1.8 T engine at the head of the four-cylinder TT line-up. The six-cylinder, 3.2-litre Coupé and Roadster quattro models with 250PS will continue as before.

The TT continues to be more popular in Britain than anywhere else in the world, and has been a significant contributor to the steep rise of Audi sales from around 40,000 in 2000 to a predicted 78,000 by the end of 2005.