It all starts and ends with a remapped ECU that squeezes 45 more horses and 65Nm of torque out of the force-fed gasoline engine, bringing the total to 286hp (290PS) at 5,100 rpm and 415Nm (306 lb-ft) at 2,700 rpm.
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Hartge's remapped ECU helps nudge the turbocharged unit's peak output to 169 horsepower (171PS) at 4,400 and torque to 265Nm (195 lb-ft) at 2,000 rpm.
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To make a better business case about its products, German tuning firm Hartge has published a video showcasing a BMW 525d xDrive with and without its power kit.
In standard guise, the 525d xDrive gets a 2.0-liter turbocharged four-cylinder diesel churning out 215hp (218PS) and 450Nm (332 lb-ft). Hartge's power kit that includes a software upgrade lifts those numbers to 254hp (258PS) and 530Nm (391 lb-ft) respectively.
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The X3 xDrive35d sports a 3.0-liter turbocharged straight-six diesel capable of delivering 309hp (313PS) at 4,400 rpm and a maximum torque of 630Nm (465 lb-ft) from 1,500 to 2,500 rpm, allowing for a zero to 100km/h sprint time of 5.8 seconds.
Not too shabby, especially if you consider that it also delivers a combined fuel consumption of 6.1lt/100 (equal to 38.6mpg US or 46.3mpg UK).
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The tweaking starts under the hood with a Hartge power kit and a sports exhaust system that improve upon the standard model's 3.0-liter turbocharged inline-six lifting output from 335hp (340PS) to 396hp (401PS) at 5,850 rpm and maximum torque from 450Nm to 530Nm (391 lb-ft) at 2,950 rpm.
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Hartge’s first take on the Bavarian model is somewhat restrained comprising of some mild styling and chassis upgrades. On the outside, the tuning firm offers its own emblems, new dual tail pipes on each corner of the bumper and a variety of alloy wheel designs in sized 19- and 20-inches shod in beefier performance tires.
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For the exterior, Hartge has created a new front apron that covers the air inlets, carbon fiber mirror caps, a discreet boot lid spoiler, a wind deflector, pin stripes and a four-piece exhaust system.
Customers can also give the hardtop roadster an even sportier stance with the addition of Hartge's alloy wheels that are available in numerous designs in sizes 18- to 20-inches, and a suspension lowering kit.
A set of aluminum pedals, a new instrument cluster and specific floor mats are some of the options offered for the interior.
Those that are interested in juicing up the Z4's powerplants will have to wait until next year when the company is expected to reveal its engine kit program.
Another day, another bodykit from German tuning firm and BMW specialist, Hartge that has released a new styling package for the X5 SUV. The tasty kit comes with a front spoiler and rear skirt, as well as left and right two-piece side skirts. Owners can opt for the available stainless steel rear silencer while Hartge also offers a sport suspension kit and the company's multispoke alloy wheels. Hartge did not disclose prices for the aero kit. Check out more photos of the neatly beefed-up X5 after the jump.
If you're looking for a bit more oomph for your new BMW 116d, you may want to check out Hartge's latest tuning program for the entry-level diesel version of the three- and five-door 1-Series hatchback. The specific package consists of performance improvements that come in the form of an upgraded ECU that boosts the 2.0-liter turbo diesel's output from 115HP and 260Nm of torque to 143HP and 315Nm (232 lb-ft).There's also a sport suspension kit that adds new springs which lower the 116d's ride height by 25mm as well as a sport exhaust system. And if you're still not content, Hartge will have no problem upgrading your bimmer with a numerous aero parts and a new set of alloy wheels and tires.
BMW tuning specialist Hartge has launched a new assortment of aero add-ons and sport exhaust systems for the 1-Series. Available parts include a front lip spoiler, rear diffuser, side skirts, roof and boot lid spoilers, carbon casings for the exterior mirrors, inserts for the lower air vents, decals and the not so necessary, Hartge emblems. The tuner has also released two new sport exhaust systems with four tailpipes for the 125i and 135i models with the M Aerodynamic package. 
After AC Schnitzer and Hamann, it's time for Hartge to release details on its tuning programme for the new BMW Z4 Roadster that has just begun to arrive in showrooms across the world. Hartge's initial offerings cover a somewhat broader spectrum than its two fellow German tuning boutiques. Aside from the firm's classic multispoke alloy wheels that are available in sizes 18 and 19 inches, Hartge's programme also includes stainless steel exhaust pipes, aluminum pedals and footrest, special emblems for the exterior and interior plus a new speedometer.
