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2015 BMW M4 Coupe

Launched out of the seat by a huge, unexpected dip in the road, yet still held largely in place by the smooth webbing of my safety belt, I clench my teeth waiting to come back to earth. A tenth of a second later, the M4 Coupe touches down and my body is slammed into the leather seat cushion. All of the air is forced out of my lungs upon landing, but the BMW's chassis, suspension and steering appear unfazed. Pleasantly surprised, I mash the accelerator to the floor in giddy pursuit of the car in front of me - an absolutely identical 2015 BMW M4 coupe.
A cavorting game of cat-and-mouse on a desolate twisty canyon in southern Portugal is an excellent way to explore the real-world driving dynamics and performance of BMW's all-new M4 Coupe. But to truly push it to the limit - without having to worry about oversize depressions in the asphalt - requires a dedicated racetrack. Graciously, my hosts have rented the famed Autódromo Internacional do Algarve racetrack, or Portimão circuit, for an afternoon of automotive debauchery.
It's hard to believe this passes for work.

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.

BMW 2 Series, X5 get their M Performance parts on

BMW models come in a number of flavors, from their standard guises to M Sport variants and M Performance models to full-on M muscle machines. But if you want to pick and choose the degree to which you want your Bimmer upgraded along the path to M, BMW automaker offers its M Performance Parts line. The Bavarian automaker already offers these performance and stylistic add-ons for a number of models, and has now released new kits for both the 2 Series Coupe and the latest X5 crossover.
The catalog for the 2 Series includes an available lowered suspension kit, upgraded brakes, new alloys, carbon aero kit and interior trim enhancements. There's also a power kit available for the 220d model that squeezes out an extra 16 horsepower for a total of 200, and a limited-slip differential and exhaust silencer for the M235i.
Upgrades to the X5 crossover, meanwhile, also include a carbon aero kit and interior trim package. The X5 xDrive35i model also gets a power kit boosting output by 20 ponies to 326 hp and an exhaust silencer. Scope out the details in the pair of press releases below and the pair of high-resolution image galleries top and bottom.