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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.

BMW i8 could get 300-hp, 2.0L turbo-four

First and foremost, the long-rumored, high-performance BMW i8 will not be called the i8 M. While the lack of an M badge might be a disappointment, it's fair to say the performance of the new model likely won't be. AutoExpress claims BMW is developing a new 2.0-liter, turbocharged, four-cylinder that will take the place of the i8's three-cylinder engine. Offering an even 300 horsepower, up from the current car's 228, total system power would sit around 450 ponies, thanks to the extra cylinder. The electric system won't be fettled with, though. If that still sounds modest, it's because it is – AE's source claims the i8 could handle another 300 hp. BMW would also make a concerted effort to at least maintain the current i8's weight, even with the extra heft of the 2.0-liter turbo to deal with. AutoExpress's source claims that BMW could skip the paint on certain exterior carbon-fiber elements while also offering a more focused, minimalist cabin to save even more weight. According to AE, this new model should arrive as early as 2016, which could result in a debut in Frankfurt this September, Los Angeles in November, or even Detroit, in January.

Alpina bringing new B4 Bi-Turbo Cabrio to Geneva

Interested in picking up a new BMW 4 Series with a turbo six? You've got options: you can get the 435i with 300 horsepower or spring for the M4 with 425 hp. But if it's the convertible model you want, we're afraid you'll be limited to the latter as the M division can't help you (at least not for the time being). But that's where Alpina comes in.
The aftermarket tuner closely associated with BMW offers the B4 Bi-Turbo (at least in Europe) with that same 3.0-liter twin-turbo inline-six massaged up to 410 horsepower that starts to pose a threat to the M4. What's more is that the Alpina's 442 pound-feet of torque eclipses the M4's 406 lb-ft, to say nothing of the 435i's 300.
Best of all, Alpina just confirmed via Facebook that it'll offer the B4 in convertible form, bringing the resulting BMW Alpina B4 Bi-Turbo Cabrio to the Geneva Motor Show. We'd expect the weight penalty to knock it slightly off the coupe's quoted 4.1-second 0-60 time, but not by much. If only BMW were to bring this one Stateside like it does with the B7 sedan.