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Alpina won't sell its 600-hp B6 Bi-Turbo in the US

Like the B5 Bi-Turbo revealed last month, the newest version of Alpina's B6 packs an upgraded 4.4-liter twin-turbo V8 now good for 600 horsepower and 590 pound-feet of torque. The result is a 0-62 time of 4.2 seconds and a top speed of 205 miles per hour, giving it similar acceleration to the M6 but a much higher top speed. Other enhancements include a sport suspension with adjustable dampers, a limited-slip differential, fully retrimmed interior, and an available brake upgrade. These are essentially the same upgrades applied to the Edition 50 that helped Alpina celebrate its half-century anniversary. But with those all sold out, the enhancements will now be available to European customers on the standard B6 – in either coupe or convertible form – starting in the spring, with prices comparing roughly to those of the M6. Unfortunately, the two-door B6 isn't available Stateside, but we can get the B6 xDrive Gran Coupe with the same output. With four driven wheels and four doors, the US-market B6 will rocket to 60 in an estimated 3.6 seconds and reach an electronically limited top speed of 200 mph – if only we had the derestricted highways to test that out. Related Video: BMW ALPINA B6 BI-TURBO WITH UPDATED 4.4 LITRE V8 BI-TURBO • V8 Bi-Turbo producing 441 kW (600 hp) and 800 Nm of torque • BMW ALPINA B6 Bi-Turbo Coupe accelerates from 0 to 100 km/h in just 4.2 seconds • Significantly extended standard equipment A limited number of fifty units of the BMW ALPINA B6 Bi-Turbo EDITION 50 were produced for our customers. Created and developed to celebrate ALPINA's 50th Anniversary in 2015, these vehicles all exhibit unique features sourced from ALPINA's long and eventful heritage. Like limited edition models of the past, the popularity of the EDITION 50 means all examples have been placed with customers. The regular version of the BMW ALPINA B6 Bi-Turbo Coupe and Convertible will continue to be available in spring 2016 and featuring the updated engine and drivetrain configuration. The powerful 4.4 litre V8 Bi-Turbo has been developed further, increasing output to 441 kW (600 hp) and 800 Nm of torque. The BMW ALPINA B6 Bi-Turbo Coupe accelerates from 0 to 100 km/h in 4.2 seconds, onto a top speed of 330 km/h. Combined consumption according to ECE Norm remains at 9.4 l/100km and 219 g/km CO2. The ALPINA sport suspension with Adaptive Drive comprises electronically adjustable dampers and active roll stabilisation.

AC Schnitzer packs 400-hp, tri-turbo diesel into 1 Series

At first blush, this might look like your run-of-the-mill BMW 1 Series, maybe with a few modifications. What you're actually looking at is a monster hot hatch with 400 horsepower and 590 lb-ft of torque. From a diesel. For this year's Essen Motor Show – Germany's equivalent to SEMA – the Bimmer specialists at AC Schnitzer prepared the ACS1 5.0d concept you see here. Its selling point (if only it were for sale) is the combination of BMW's most powerful diesel engine and its smallest model. It utilizes the 3.0-liter triple-turbocharged inline-six diesel engine from the M50d versions of the 5 Series, X5, and X6 sold in Europe. That engine is normally rated at 376 hp and 545 lb-ft, which is already a ton of muscle. But Schnitzer has bumped up the output on both counts, and slotted it into a 1 Series hatchback. The result is a 0-62 time of just 4.5 seconds, leaving the M135i and M235i in a cloud of diesel soot. Of course, Schnitzer has plenty more to showcase at Essen this year, including modifications for the 3 Series, X6 M, and Mini JCW. And you can bet all the other major European tuners will be on hand at the expo to show their wares, too. But as far as outlandish creations go, this monster diesel hot hatch is what's caught our attention. Compact and incredibly powerful The 1-series by AC Schnitzer with impressive motorsport quality At first sight, you do not expect brute force from the BMW 1-series. So the performance of the compact Bavarian after the AC Schnitzer tuning experts have equipped it with the M50d power plant and impressive performance upgrade, is even more incredible. Originally designed for the 5-series, the "Diesel M-Technik" pack propels the 1-series a long way forward. The smallest BMW series now has an impressive drive concept from AC Schnitzer. After the performance upgrade, the concept engine of the ACS1 5.0d delivers 294 kW/400 hp and 800 Nm torque for generous thrust. Equipped in this way, it takes just 4.5 seconds to sprint from 0-100 km/h. The acceleration from 80-180 km/h is even more impressive: the ACS1 5.0d takes just 7.9 second for this. The smallest of the compacts, the 114i, is already impressive thanks to a power increase by 52 hp to 154 hp. The four-cylinder petrol engine of the 116i, thanks to motorsport technology, now delivers 204 hp instead of 136 hp. The same figure is also achieved by the 118i, which previously had 170 horses under the bonnet.

Looking back at 84 years of BMW roadsters

Today BMW is a top player in the luxury vehicle market, but it wasn't always so. With origins as an airplane engine builder early in the 20th Century, it broke into the automotive industry when it bought Automobilwerk Eisenach in 1928. That German manufacturer was licensed to build the Austin Seven under the name Dixi DA-1, which could be had in a roadster body style. In 1929, BMW dropped the Dixi name, and by 1936, it was building a car it designed in-house, the 326 sedan. That was followed by the company's first roadster of its own design, the swoopy two-door 327 of 1937.
XCAR picks up there, and gives a history of BMW's iconic roadsters starting with the 327, ending with today's Z4, and covering everything in between - including the beautiful post-war 507 of 1957 and the funky, plastic-bodied 1989 Z1.
The video, which we've included below, is a good history lesson and a great chance to see a bunch of classic BMWs, spanning 84 years, all driven back to back within the safe confines of a racetrack. When you have a spare 20 minutes, go ahead and take some time to watch it.