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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 offering Track Handling Package for 2 Series

After getting a chance to drive the BMW M235i earlier this year, we mentioned our regret at not being able to sample the lighter and less powerful 228i Coupe. We'd like to have seen how close the latter could get to the former, noting that "there's a lot of room for upgrades with the $11,000 retail difference." BMW is closing that performance gap slightly, announcing that a Track Handling Package will join the options sheet for the 2015 228i Coupe.
The group bolts on Variable Sport Steering, Adaptive M Suspension and M Sport Brakes behind new 18-inch lightweight wheels wearing Michelin Pilot Super Sport tires. There's no change to the 240-horsepower four-cylinder, but a coupe so equipped should be able to do plenty more with the horses it has thanks to a faster steering rack, sharper handling due to additional sensors and a ten-millimeter drop in ride height, and larger brakes and discs.
BMW has used the New York Auto Show as a venue to introduce the new Track Handling Package, and it will roll onto showroom floors in July and pricing will be announced sometime between now and then. Takers can get it with both the six-speed manual and eight-speed Sport Automatic, see it in the high-res image gallery above, and read about it in the press release below.

2021 Acura NSX leads this month's list of discounts

The 2021 Acura NSX is an especially good deal this month. Not only does it carry the torch as the vehicle with the biggest discount measured by the percentage off its sticker price, that discount is also the largest of any vehicle currently sold in the United States when measured in sheer size. Here are the numbers: The average sticker price of all 2021 NSX models sits at $161,040. Buyers are paying an average transaction price of $142,907. That equals a discount of 11.3%, or $18,133 of savings. No other vehicle comes close to that kind of discount, with the next largest being for the 2021 BMW 7 Series. Buyers of that luxury sedan are saving an average of $11,661 for a transaction price of $94,884. There's another sharp dropoff after the BMW. In third place is the 2021 Maserati Quattroporte, which actually kicks off a party of savings at Trident dealers across the United States. The '21 Quattroporte is seeing $7,743 cut off its sticker price for an average transaction of $121,962. After that comes the 2021 Maserati Ghibli, which is averaging $7,394 off for a sign-on-the-dotted-line price of $78,592. If you don't want a sedan, the 2021 Maserati Levante's $6,738 discount equals an average transaction price of $78,592. For a look at the best new car deals in America based on the percentage discount off their suggested asking prices, check out our monthly recap here. And when you're ready to buy, click here for the Autoblog Smart Buy program, which brings you a hassle-free buying experience with over 9,000 Certified Dealers nationwide.