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A closer look at the 2015 BMW M3 and M4

It's fair to say we're going to miss the E92 BMW M3. Its high-revving V8, flame-styled looks and excellent driving character made it quite simply one of the best cars of the 2000s. Its replacements, the new M3 Sedan and M4 Coupe have a lot to live up to.
We still have a few months to wait until we can drive the new cars, but that doesn't mean we can't get excited in the meantime, learning everything we can. To find out, we sent west coast editor Michael Harley onto the Detroit Auto Show floor earlier this week to talk about the new M cars with BMW product manager Victor Leleu.
If you want a concise, but highly informative rundown of these new cars, look no further than this video. Leleu talks about the styling, weight savings and engines in a lot of detail, making this an interview M fans aren't going to want to miss. Scroll down for the full video.

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.

Hamann BMW M6 Mirror can now cash the checks its body writes

Anyone remember the Hamann Mirror? Need a refresher? The Mirror is German tuning company Hamann's idea of a BMW M6. It was shown at the 2013 Frankfurt Motor Show as an M6 Gran Coupe, sporting a ridiculous paint job and some meaty, multi-spoke 21-inch wheels.
Consider this car the Mirror Mark 2. Based on the M6 Coupe, Hamann has applied a similar visual theme, using the same 21-inch wheels from 2013. Whereas the Gran Coupe rode around with a stock powertrain, though, there's been no such restraint with the two-door Mirror. A fine 620 horsepower is available from the 4.4-liter, biturbocharged V8, an increase of 60 horsepower. Torque is up as well, from 501 pound-feet to a whopping 560, meaning this M6 has speed to match its looks. Hamann claims the Mirror's newfound grunt allows it to hit 62 miles per hour faster than the standard M6 (we'd certainly hope so), although it won't mention a specific number.
The suspension, meanwhile, has been dropped 1.37 inches, or about a third of an inch lower than the Frankfurt Mirror. That drop is complemented by the Mirror's bodywork, including the exposed, carbon fiber hood and the flared fenders, which can now accommodate the enormous 305/25 rear rubber. Hamann has also paid some attention to the front and rear aerodynamics.