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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.

BMW M235i in circuit scrap with legendary E46 M3 CSL

Earlier this month, we brought you news that BMW's one-year wonder, the 2011 1 Series M Coupe, is actually trading for more money today than it did when new. That sort of short-term appreciation is a major rarity with modern production cars, but apparently it's not the only BMW enthusiast coupe to enjoy far-above-average residual values. The not-for-North America 2004 M3 CSL, itself a single-year offering, apparently also fits that description, as we've just learned from Auto Express.
The M3 CSL ruled overseas BMW showrooms a decade ago, with just 1,400 examples built. Based on the well-regarded E46 M3, the rare two-door was relieved of extraneous bits for improved track work and driver fidelity, coming in at around 240 fewer pounds than a garden-variety M3. With carbon-fiber-reinforced plastic bodywork, thinner glass and a lot less sound insulation, the CSL was one of the more raucous cars of its day. Like the 1M Coupe, it was also one of the more connected cars of the era, with a retuned suspension, quicker steering, and a bit more power than its brethren.
As Auto Express points out, a good used one commands about the same money as a brand-new 2014 M235i - the closest thing BMW makes to a 1M Coupe today - which makes this video track battle an interesting new-versus-used showdown. According to AE, a well-sorted used M3 CSL will run UK consumers anywhere between £30,000 and £35,000 - roughly $50,000 to $59,000 US. That's a massive premium over the $10k-17k British buyers can expect to shell out for a comparable standard M3, similar to the story that plays out for the 1M versus lesser 1 Series variants.

2013 Dinan S3 BMW 550i

Steve Dinan has been enhancing BMW models since 1979. But don't throw his company into the ring with the dozen or so other tuners who tweak, tinker and piggyback upgrades on the famed German marque. Dinan is a tuner, but it's also an engineering firm that writes its own software, builds its own parts and then backs everything it does with a factory-grade warranty. That sort of fastidiousness comes at a price, but most of its customers - including the powerhouse of BMW Motorsport - rely on Dinan to help them come out on top.
In stock form, BMW's 550i is a formidable four-door with a twin-turbocharged 4.4-liter V8 rated at 400 horsepower and 450 pound-feet of torque. While those figures allow it to run with quick company (0-60 in 5.0 seconds, according to the automaker), Dinan puts the sedan's kettle on full boil with its S3 package. Starting with the engine, the performance engineering firm bolts on larger turbochargers, air-to-water intercoolers, a trick strut tower brace cold air intake, a quad-pipe free flow exhaust and its own engine management software. Pump in some premium fuel, and the result is 542 horsepower and 587 pound-feet of torque. Power is sent through the stock eight-speed automatic to a limited slip rear differential (Dinan will upgrade xDrive all-wheel drive models, too).
The Dinan S3 also features and extensive suspension upgrade that includes new front camber arms and low compliance rear control arms (engineered to reduce understeer and improve turn-in). The stock dampers are retained, but new bump stops are installed along with new springs. Overall, the car rides about a half-inch lower than stock to improve roll rate. To reduce unsprung weight, forged 20-inch HRE Performance wheels are fitted at all four corners (wearing Michelin Pilot Super Sport tires - 275/35ZR20 up front and 295/35ZR20 in the rear). Lastly, the company remaps the factory Electronic Damper Control (EDC) software with its own Dinan Shockware to work in conjunction with the new enhancements.