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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.

BMW's plans for next plug-in i model, due after 2020

BMW entered the fight in the green car ring with gusto thanks to the one-two punch of the i3 and the i8. However, it seems that there could be a wait ahead before the German's i sub-brand is ready to land another strike at the market. "We are still in the strategic research phase where we brainstorm," Klaus Frohlich, BMW Group development boss, said to Automotive News Europe about the future vehicle. He indicated the next new model to bear the i prefix wouldn't arrive until after 2020. Frohlich also underscored that the sub-brand's products wouldn't be based on a standard BMW product. The German brand was at one point rumored to have a model called either the i5 or i7 on the way that would have added a plug-in hybrid drivetrain to the 5 Series. Frohlich's statement would seem to invalidate that possibility. Although, there's nothing stopping the vehicle from carrying regular BMW branding in the vein of the X5 xDrive40e PHEV. The current i-badged models won't just stagnate on the market in the meantime, though. "We have a minimum 20 percent battery density improvement every three years, thus over the i3 and i8's life cycle, we will offer more performance, more range or a combination of the two," Frohlich said to Automotive News Europe. Sadly, current owners won't be able to upgrade to the improved parts, though. Rumors about a third i sub-brand model go back years with much of the talk swirling around the i5. In addition to the speculation about a 5-Series-based version, there was also supposed to be a stretched variant of the i3 with that name, possibly even with a hydrogen fuel cell version. Although, BMW claimed the vehicle was purely "hypothetical." Related Video:

BMW to change model designations, further yet from actual displacement?

Once upon a time, you could look at the back of a trunk lid of a BMW and come up with a pretty fair idea of what sat under its hood. For example, a 320i was a 3 Series with a fuel-injected, 2.0-liter engine, a 328i was a 3 Series with a fuel-injected, 2.8-liter engine and a 328Ci was a two-door 3 Series with the same engine. Those were good days.
Today, though, that simplicity is dead and gone. A 328i now has a 2.0-liter engine, just like the 320i, while the simple "C" designation that was affixed to two-door models has been replaced with a "4," so we have a 428i and a 435i. It gets worse, though. A 550i uses a 4.4-liter, twin-turbocharged V8 (it should be a 544ti, although we'd be willing to hear an argument for "tti") and a 740i uses a 3.0-liter, turbocharged six-cylinder, which is the same engine found in a 535i. It's madness.
And, well, it's about to get madder, if a post on a BMW enthusiast forum is to be believed. According to f30post.com, we could see a shakeup in at least the 3 and 4 Series nomenclature, thanks to an impending refresh that will see the addition of new, turbocharged four- and six-cylinder engines, codenamed B48 and B58, respectively.