Mercedes W113 230sl, 250sl, 280sl Top Side Window Seals on 2040-parts.com

BMW M4 Convertible revealed. Price from £60,730

The BMW M4 Convertible (pictured) revealed We reported last month that the new BMW M4 Convertible would debut at this year’s New York Auto Show, and here it is ahead of that debut complete with trick folding metal roof, 425bhp and a price tag that just nicks over the £60k line. A direct replacement for the old M3 Convertible, the M4 Convertible will cost you just over £4k more than the M4 Coupe, but for the extra money you get the same car but with infinite headroom – and a big weight penalty. The new 3-piece metal folding roof can be tucked away in a mere 20 seconds at the flick of a switch, with better noise insulation than the M3 Convertible had and more room in the boot when the roof is down too.

Nissan expands Beijing studio

With the expansion of the Chinese market, the country's position in the automotive industry is increasingly important. Homegrown design elements look set to enhance brand competitiveness, while the on-the-ground knowledge garnered by Chinese studios is becoming invaluable feeding back into global companies. It's clear therefore that Nissan Design China (NDC) will play an increasingly important role in Nissan's global design network.

Arrinera 2013 Arrinera

New Polish car company Arrinera has announced that work on the prototype of the new model – also called the Arrinera confusingly – is complete and it will now be embarking on moving the design to production. The company has claimed that the inspiration for the car's design came from that of the stealth-fighter, although there are obvious features reminiscent of Lamborghini, such as the doors, a Reventon-esque front end, Gallardo-like rear intakes, and vents ahead of the rear wheels similar to those on the Murcielago. Arrinera asserts that the cabin will be adorned in only the finest handcrafted leather and carbon fiber and highlighted with aluminum trim.