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AC Schnitzer ACS4 Sport packs 510 hp under a subdued carbon fiber bodykit

One of the interesting things about the Geneva Motor Show is the breadth of the European auto industry that it covers. Beyond just the stands from major manufacturers and boutique marques, the event also hosts the regions top tuners. Among them this year are the BMW specialists AC Schnitzer, with myriad upgrades for the M4. By the time the company is done, the coupe gets renamed the ACS4 Sport. The M4 is already a potent machine with its 431-horsepower, turbocharged inline-six, but for customers willing to spend the money, more performance is always possible. AC Schnitzer's engine upgrade takes power up to 510 hp and 476 pound-feet of torque, and buyers can also add a new exhaust with carbon-fiber-surrounded tail pipes barely protruding from the rear. The company offers two suspension kits, as well. The first lowers the BMW by 1.0-1.2 inches in front and 0.4-0.6 inches in the rear. However, for drivers who really want to scrape the ground, an adjustable racing option drops the front by 1.2-1.6 inches and the back by 1.2 inches. Of course, AC Schnitzer's buyers also want to show off their cars' added performance, and the company is ready with a host of carbon fiber pieces. Up front, there's a new front spoiler, splitter and side flicks, and the rear is available with a diffuser, roof spoiler and fixed rear wing. A wide variety of wheels finish off the sporty look, including the brand's AC1 BiColor twin-spoke design offered in forged or standard versions. Get a full look at the German tuners fairly tasteful upgrades in our gallery from the show floor, above. ?"Man, Machine & More" – The M4 by AC Schnitzer Aachen-based tuning experts open new dimensions in the field of Motorsport power Man, machine & more - The tuning experts at AC Schnitzer have given the BMW M4 with Motorsport power a further kick of energy. Once again, the Aachen-based tuning specialists have shown that there's no upper limit to power and sporting performance. To build up the muscle power of the BMW M4, AC Schnitzer has provided a performance upgrade containing of an additional control unit which increases the performance from 431 to 510 hp, and from 550 to 645 Nm. Scope of delivery of every AC Schnitzer performance upgrade includes always a two years guarantee which can be upgraded up to three years. After a visit to the Aachen workshops, the powerful energy combustion developed with the AC Schnitzer "Efficient Performance" know-how is also revealed in the exhaust of the M4.

2015 BMW Alpina B6 Gran Coupe challenges the M6 in New York

Despite being a well-respected outfit for decades, Alpina remains something of a mystery to many stateside BMW fans. In Europe, Alpina has established itself as a first-rate source for breathed-upon high-performance Bimmers, and it's looking to continue picking up traction on our shores. The US has received a handful of Alpina models through BMW factory channels, namely the 7-Series-based B7, and now we're getting another fast four-door with the debut of the BMW Alpina B6 xDrive Gran Coupe at today's 2014 New York Auto Show.
The B6 Gran Coupe stands as an interesting sibling to the factory's M6 Grand Coupe. Both are propelled by a 4.4-liter twin-turbo V8, but the tunes are quite different. The Alpina produces 540 horsepower and 540 pound-feet of torque, which is 20 hp less than the M6, but with 40 lb-ft more torque. An eight-speed automatic and all-wheel drive mean that the B6 is about half a second quicker to 60 miles per hour than BMW's own creation. Plus, the B6 has an unrestricted top speed of 198 mph, making it one seriously rapid 6 Series Gran Coupe.
The sport sedan also wears other Alpina goodies like 20-inch versions of the brand's 21-spoke wheels and exclusive color options. The B6 Gran Coupe goes for $118,225 (including destination), and will be available through BMW dealers immediately after the auto show ends. More info about the B6 is in the release below.

BMW to offer carbon fiber wheels in a year or two

The Citroën SM sat on the first set of production glass fiber and resin wheels in 1972 when parent company Michelin developed the exotic hoops in order to take the SM rallying. It wasn't until 2008 that we got the first all-carbon-fiber wheel for passenger cars in the form of a prototype model from Weds Sports in Japan that remained a prototype. Australian company Carbon Revolution followed that a year later with its CR-9 all-CF wheel, first introduced on the Shelby Ultimate Aero and now available for independent purchase for about $15,000 per set. BMW could be the first OEM to offer entire wheels in carbon fiber reinforced plastic in two years.
The wheels - either all-CFRP or using a CFRP rim and alloy spokes - were shown off during BMW's Innovation Days in Munich and are products of the development work done on its i-branded cars. The full-CFRP wheel is 35-percent lighter than a forged alloy wheel, the hybrid alloy and CFRP wheel is 25-percent lighter, making for a decent drop in unsprung rotating weight. As demonstrators during a tech day the wheels aren't yet in the pipeline for production and EU approval, but an article in Auto Express claims that they could be on the market as soon as two years from now.
Other possible parts include a full carbon fiber steering wheel and propeller shaft, the latter of which is coming as a single-piece component on the new M3 and M4. BMW is also talking up its use of secondary carbon fiber - waste material from i3 and i8 production - that can be used for items like IP support structures, seat frames and spare wheels in place of traditional metals like aluminum and magnesium. There's an excerpt of the Innovation Day press release below with more details.