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BMW dishes on 'lightweight' 2014 M4

BMW's M cars are not what we'd call featherweights. Sure, the big, bruising twin-turbocharged V8s deliver a lot of power, but the fact of the matter is that more weight often equates to less fun.
Which is why we're so excited over a recent sit-down the blokes at Top Gear had with BMW's product manager for small and medium cars, Matt Collins. The chat led to talk of the M3 Coupe replacing M4. Collins confirmed that, yes, the new M4 would be turbocharged. The new engine will also be a six-cylinder, which should make purists happy.
"What we'd like is more focus on lightweight engineering." -Matt Collins

This insane Barris-like custom car is a backyard BMW Z3 build

This is the second car made by Englishman Paul Bacon and it's called the Cosmotron, fashioned over 18 months in his backyard shed. Underneath that Jetsons bubble canopy and swinging-sixties body are the bones of a 1998 BMW Z3 with a 2.8-liter inline-six. Bacon stripped the roadster down, then built it back up using fiberglass laid over polystyrene foam, and leather hand-stitched by his wife. Bacon said he remembers how we were told that 21st-century cars would look like the Cosmotron, and since they don't, he had to fix the error. The list of 20th-century add-ons, however, is impressive, like the six SU carburetors topped off with department-store salt and pepper shakers, and the rear grille decorated with shiny plastic tops from moisturizer bottles. After driving the Cosmotron for two years, Bacon sold it to get ready for his third project. You can hear Bacon and the new buyer tell their stories in the video above.

BMW M4 Convertible poised for Goodwood unveil

It shouldn't be a shock that BMW is working on a convertible version of the M4. Not only have we caught it testing twice, but this is an automaker that seems willing to build a vehicle for nearly every buyer's needs. Evo claims that the high-performance droptop is going to debut at this year's Goodwood Festival of Speed in England from June 26-29.
Judging from the spy shots we've seen, the M4 Convertible will consist of a retractable hard top like the 4 Series cabrio. Other than the roof, there aren't expected to be many changes from the coupe. The engine will be the same turbocharged, 3.0-liter inline six-cylinder engine, but the added weight of the roof and its mechanism may take a small bite out of performance.
We spoke to BMW USA about the rumor and were told that it has no comment at this time. After the M4 Convertible, Evo claims that BMW is working on a M4 Gran Coupe. How that would be all that different from an M3, isn't exactly clear.