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BMW M4 Convertible spied with naked top and trunk

Our trusty spy photographers have been at it again, snagging these first images of the forthcoming BMW M4 Convertible without camouflage on its retractable roof and rear deck. You'll recall that this is not the first time we've seen the followup to the M3 Convertible, but that the last batch of images we had were encumbered by a lot more camouflage - this car is virtually naked by comparison.
Not surprisingly, the M4 looks to share its folding hardtop design with the standard 4 Series droptop, and it should operate in a similar manner as well. It's no surprise, but it looks like BMW is going to try and make the transition from M4 Coupe to M4 Convertible as effortless as previous efforts converting the M3 to an M3 Convertible. That should mean that below the beltline, this car is nearly identical to the coupe we saw in Detroit.
As for the camo'd features on these spy photos, the hood, front fascia, rear fascia, quarter panels, side sills and mirrors have all been shown on the M4 Coupe, and don't really bear mentioning. There's been no word of just where the M4 Convertible will make its debut, although considering the lack of disguise on this car, Geneva seems like a likely destination.

Researchers halfway to cutting carbon fiber costs by 90%

Carbon fiber has been utilized for decades to build racecars, as a means to cut weight while maintaining strength. But until recently, the space-age material has been largely absent from the street on anything but supercars because of the expense to use it. Recently, BMW signaled a major shift in that trend when it starting using carbon fiber reinforced plastic panels on the i3 and i8. This relatively small scale start might be just the beginning; the German company believes that a breakthrough to inexpensively manufacture the lightweight stuff is just on the horizon.
MAI Carbon Cluster Management GmbH counts BMW, Audi, Airbus, the German government and many other organizations as supporters, and it's researching how to make carbon fiber cheaper to produce, according to Automotive News Europe. The company thinks it can reduce costs by 90 percent in the near future. "We've certainly reached a halfway point on our cost-cutting target for suitable carbon-fiber parts," said project head Klaus Drechsler to Automotive News Europe.
Unfortunately, it isn't entirely clear just what MAI Carbon is doing to make such a huge leap possible. However, a recent post on the company's website talks about a new form a carbon fiber using a thermoplastic matrix that could be cured in less than three minutes. That's compared to about 90 minutes in the traditional process with an autoclave.

BMW M135i vs. Mercedes A45 AMG in Euro small-lux throwdown

BMW and Mercedes-Benz - please, please, please bring the M135i and A45 AMG hatchbacks to North America. For as long as we can remember, buyers in the New World have been forced to look longingly at Europe and Great Britain and the excellent super hatches that are so routinely offered there. And while we're quite content with the Ford Focus ST and Volkswagen GTI, having a 360-horse five-door with a premium, content-rich interior sounds quite nice.
Our envy for Europe has grown after watching the latest video from Drive, which stars Chris Harris, the Mercedes-Benz A45 AMG and the BMW M135i. This latest battle between MB and BMW takes place on both road and track, with Harris providing a running commentary. If you're interested in the upcoming Mercedes CLA45 AMG, you should pay special attention to the section on the A45, as the two are essentially fraternal twins. While the video is a bit on the long side, it provides a comprehensive rundown of both cars, giving those of us in North America just a small taste of what we're missing. Check it out by scrolling below.