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

BMW Concept X4 (2013) first pictures of baby X6 coupe-SUV

This is the BMW Concept X4, which borrows the idea of an SUV with coupe proportions from its X6 brother, and shrinks the template down to the size of an X3. But don't be fooled by the 'Concept' tag of this car – like the Concept 4-series coupe we saw in 2012, the X4 is very much confirmed for production, and will receive only detail styling tweaks before it goes on sale in mid-2014. It'll be built alongside the X3, X5 and X6 models at BMW's Spartanburg factory in the USA from early 2014.

Spy Shot: 2014 Subaru WRX coupe spotted testing

High on many Subaruphiles' wish list is a new two-door WRX STI, and the Japanese manufacturer might just be working on such a model. A two-door WRX-looking, highly camouflaged mule was recently spotted testing in the Ann Arbor, Mich., area. Subaru has a research-and-development facility in Ann Arbor.

Ariel's Atom returns faster than ever

BRITISH firm Ariel has announced an upgraded version of its sensational Atom sportscar that is faster than ever, making it one of the quickest cars on sale today. The Atom 3.5R showcases a number of upgrades over the outgoing model which contribute to the sensational performance. The 2.0-litre Honda V-TEC engine has had its supercharger revised to give 350bhp and over 240lb.ft of torque, while the gearbox is now a six-speed paddleshift system that can manage five downshifts in less than a second.