Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Is Stefan Sielaff about to jump ship from Audi to head BMW interior design?

Here at CDN we hear plenty of gossip, much of which ends up as hot air and hardly any of which we publish. But when the source of a potential story is as reliable as Georg Kacher – a giant (physically and metaphorically) of a journalist with uncannily strong connections to those within the Germany industry – there's good cause to pay attention. His 'predictions' rarely fail to materialize.

BMW Z4 sDrive 35is (2009) at Detroit motor show 2010

These are the first official pictures of the new high-performance BMW Z4 sDrive 35is, unveiled today at the Detroit motor show. A bit of a mouthful (that's BMW's new nomenclature for you), but it's essentially the fastest, hardest Z4 to date since the recently departed M roadster curled over and died.The Z4 sDrive 35is uses Munich's existing 3.0-litre twin-turbo straight six, tweaked to produce 335bhp and 332lb ft of the twisty stuff all the way from 1400-4500rpm. That's one flat torque curve, and a 29bhp jump over the regular sDrive35i.

London's GPS-based speed-limit trial puts Big Brother's foot on the gas pedal

A fleet of 12 Toyota Priuses in London have been fitted with GPS-linked speed limiters to measure how drivers respond to having their speed controlled by a computer rather than their own feet. For now, the trial is local to London, run by Transport for London, the agency that manages the city's roads, buses, subways and trains. The agency is using its own fleet of Priuses for the test and will add a bus and a taxi later this year.