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From performance parts like catback exhaust systems and ECU tunes to pedal sets, you'll find a wide range of aftermarket parts and accessories from some of the industries top brands listed right here for your 4-series.

BMW M Performance 4-SeriesParts & Accessories

BMW M Performance Parts Catalogue.pdf

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Hamann

Hamann 4-Series Parts List

The Hamann BMW F32 4 series Coupé and F33 convertible features an additional aerodynamic body styling program / body kit, Hamann alloy wheels,
19” 20″ 21” Anniversary EVO, Edition race, unique forged, professional light alloy wheels, sport suspension, increased ECU power upgrades and exhaust systems. Individual interior and exterior detailing in carbon fibre and aluminium are also available.

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Alpina

Alpina 4-Series Parts Catalogue

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Hartge

Hartge 4-Series Parts Catalogue

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AC Schnitzer

AC Schnitzer F36 4 Series Gran Coupe Catalog
AC Schnitzer F32 Coupe Catalog
AC Schnitzer F33 4 Series Convertible
AC Schnitzer F82 M4 Coupe

With its upgrade of the new BMW 4-series Coupé, AC Schnitzer is again reaching for the "Tuning Crown“. The Aachen-based tuning company presents the world premiere of its own version of the sporting mid-range coupe at the Essen Motor Show from 30th November to 8th December 2013. The tuning specialist again impressively demonstrates how to transform a base model from BMW into royalty. From engine, through suspension, bodywork and wheel sets, to the interior: the BMW 4-series Coupé has been comprehensively refined.

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Dinan

Dinan 4 Series Performance Parts Catalog

Powerful aesthetics and powerful performance to match are what comprises the all-new BMW 4 Series character. Add in a low center of gravity to this coupe and an efficient, TwinPower Turbo engine and you have everything you need for an exhilarating drive.

Dinan® Engineering helps optimize the BMW 4 Series model’s already robust performance by unlocking its engine’s true potential with a host of aftermarket parts and upgrades. Take a look at the full selection of BMW 4 Series performance upgrades and make your Ultimate Driving Machine all it can be.

 

[MPWR]

Thanks for putting together this list.
And this is just the beginning, still many parts coming out from other brands as well and so many to choose from already.

 

[MPWR]

G-Power Offers a Substantial Upgrade Package for the BMW M3 And M4

G-Power came to its senses and finally made a performance upgrade less powerful than an earthquake.

The German tuning-house is well-known for its obscenely-powerful modified Bavarian marvels. In fact, some BMW aficionados have developed a Pavlovian reflex and automatically associate the term “G-Power” with a very potent BMW.

They’re right, though, because G-Power’s latest offering consists of a tuning upgrade dedicated to BMW’s current M3 and M4 sports cars, which boosts the power output of the vehicles all the way up to the M5’s territory.

Thanks to an in-house developed Bi-Tronik 2 V2 ECU remap, the German tuning specialist was able to extract 552 horses from the 3-litre, 6-cylinder Twin-Turbocharged engine, making it as powerful as the standard M5. Come to think of it, the 700 Nm (516 lb-ft) torque figure surpasses the M5’s output, so that makes the tuned cars mightier than the stock V8-powered monster.

FYI, that’s 127 horses more than the stock engine delivers and if you think a remap on these things is a walk in the park; well, think again! To implement such an upgrade, G-Power had to crack the factory 128-bit encryption and while they were at it, a speed limit bypass was considered a must.

In fact, at the customer’s request, the Germans will raise the top speed all the way to a theoretical 330 Km/h (205 Mph), even if G-Power states that in reality the car will actually achieve only around 310 km/h (192 Mph).

But this is not only about brute force, because G-Power concentrated on reducing unsprung mass for improved handling by adding its 21-inch Hurricane RR forged alloys in the package. How could a 21 inch rim reduce unsprung weight? Well, they’re made from ultra-light aircraft-grade aluminum.