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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 releases complete pricing info on M3 and M4

When BMW unveiled the M3 and M4 at the Detroit Auto Show back in January, we told you that the new sportsters were starting at $62,000 and $64,200, respectively. That leaked info, though, only told a small part of the story for the new M cars. Now, we have the complete pricing sheet on the new coupe and sedan, direct from BMW.
The pricing intel that we had at the time was correct - prices start at $62,000 for four doors and $64,200 for two. Those prices don't include the $925 destination charge. Potential customers should also plan on spending an extra $550, as seven of the eight paint options are of the metallic variety. BMW's trademark Alpine White is the only no-cost paint option.
As for the cabin, customers will, interestingly, have the choice of a cloth/leather combination as standard. That's in addition to the standard suite of leather options. There are also extended leather and full leather options, for $950 and $3,500, respectively. There are three option packages available, covering all the extra goodies for the M3 and M4.

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.