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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.

Land Rover Defender V8, next Range Rover, new BMW M3 share the Nurburgring

From open-track days to 24-hour races, so many events are held on Germany's Nurburgring track that carmakers need to share the tarmac with their rivals to put new models through their paces. Industry pool days are normally closed to the public, but a seven-minute video reveals what Land Rover, BMW, and several others are testing. Posted on YouTube by StatesideSupercars, the video shows prototypes racing around the track in the mid-summer heat. Land Rover's engineers are busy putting the final touches on the V8-powered variant of the new Defender, which our spies have previously spotted testing in its home country of England, and they're developing what looks like the high-performance, SVR-badged version of the next-generation Range Rover due out in 2020. As we reported earlier in 2020, the hot-rodded Defender packs a 5.0-liter V8 between its fenders, though its horsepower and torque outputs remain under wraps. Unverified rumors claim it will arrive as a limited-edition model to avoid sending Land Rover's fleet-wide CO2 emissions through the roof. And, the video confirms chassis engineers have made extensive modifications to the SUV's suspension, partly to keep body roll in check. Walking down the pits, members of BMW's testing team are getting up early to put track miles on an enigmatic variant of the face-lifted M5, and on the next-generation M3. We've already seen the M5 in the metal, so why is it still camouflaged? One possible answer is that we're looking at the rumored CS version, which should receive a 641-horsepower V8 thanks to software tweaks and a better cooling system. The simpler (and more boring) possibility is that BMW isn't quite done testing the M5, and it doesn't want to waste time removing the black and white wrap. Your author regularly spotted i8 prototypes in full camouflage regalia months after its debut. As for the M3, much has already been said about its mammoth grille, which seemingly mirrors the one worn by the new 4 Series. Autoblog drove a pre-production prototype in June and walked away impressed. It receives an evolution of the X3 M's 3.0-liter straight-six turbocharged to 473 horsepower, though selecting the optional Competition package will increase that figure to 503. And, fear not: The six-speed stick is coming back. Land Rover and BMW aren't the only companies playing on the 'Ring.

Rolls-Royce Cullinan and BMW 8 Series spied south of Death Valley

Recently, we've stumbled upon a number of manufacturer prototypes running around. Usually, spy photographers sit and wait for hours with cameras primed in order to get a few shots of a car. We just got lucky. First, we caught the new Chevy Corvette ZR1 convertible during a Facebook Live video. A week or so later McGraw snapped a video of a ZR1 coupe cruising in his neck of the woods. Today, our ace photographer Drew Phillips caught a BMW test fleet filling up the new Rolls-Royce Cullinan and 8 Series coupe in Baker, Calif. Baker sits along Interstate 15, about halfway between Los Angeles and Las Vegas. It's just south of Death Valley, and, being late August, suggests that BMW was doing some hot weather testing. Drew was filling up his car when the fleet rolled in. There were at least two of the new king Rolls and a single 8 Series. Both cars were wearing a full swirl camouflage wrap. It's not an uncommon place to see prototypes. Still, seeing a whole fleet roll in is quite a sight. We've seen official photos of the Cullinan before, but these pictures give us our best view of the profile and rear we've had so far. From a distance, it looks like a high-riding version of the new Phantom with a hatch in place of the trunk. The taillights are obviously just filler units. Expect the final version to look very much like the squared off LED units on the Phantom. Likewise the interior and engine should be straight from the Phantom. That means a twin-turbocharged V12, though power is likely to be sent to all four wheels. We've seen the full BMW 8 Series concept a few times now. The proportions on the production car look the same, with a long hood and even longer wheelbase. The nose isn't quite as aggressive as the concept, but we expected the styling to be toned down to meet crash and safety standards. As for engines, look for six, eight and (hopefully) 12-cylinder power under the hood. A plug-in variant is also expected. Both cars have been in development for a long while, so look for full debuts sometime this auto show season. Maybe we'll happen upon some more test mules between now and then. Related Video: