We would like to introduce you to a very special duo: the Porsche 911 GT3 RS with the Weissach Package, and the custom Harley-Davidson Softail Breakout built to match it: the Thunderbike GP-Weissach.

Together with our customer Stefan, we created a project that bridges the gap between high-performance automotive engineering and handcrafted custom motorcycle design. This is not our first collaboration with him. Nearly ten years ago, Stefan inspired one of our most iconic builds, the Lamborghini Aventador–themed Thunderbike OUTERLIMIT. Now, the story continues with a new interpretation of power, precision and style.

The inspiration for the GP-Weissach project comes directly from Stefan’s Porsche 911 GT3 RS (992.1), a machine that represents the ultimate track-focused driving experience. Its 4.0-liter naturally aspirated engine delivers 525 hp, accelerating the 1450 kg car from 0 to 100 km/h in just 3.2 seconds. The Weissach Package further enhances performance by reducing weight by around 15 kilograms through targeted lightweight construction.

Visible high-gloss carbon components such as the front hood, roof, exterior mirrors and wing elements emphasize the motorsport character. Inside, the combination of Race-Tex upholstery, red contrast stitching, magnesium shift paddles and carbon fiber surfaces reflects a pure racing atmosphere. Even the magnesium wheels finished in Pyrored inspired the key color accents of our motorcycle.

For the bike, we selected the Harley-Davidson Breakout FXBRS with Milwaukee-Eight engine as the foundation. This model offers the ideal frame geometry to integrate our GP rear conversion and the substantial 9×21-inch rear wheel. The cockpit retains the original digital speedometer but is now seamlessly integrated into a custom-milled triple clamp. The goal was not to copy the Porsche, but to interpret its attitude. Colors, proportions, finishes and materials were chosen to translate the GT3 RS design language into a new aesthetic expression on two wheels.

The GP-Weissach incorporates the latest developments from our high-end GP component line. It features aerodynamically optimized triple clamps, redesigned handlebar mounts with Rebuffini RR90 controls, and a new GP front mask, all contributing to a dynamic and athletic stance. The open primary drive adds mechanical transparency and highlights the powertrain.

The single-sided swingarm, milled from a solid block of aluminum, allows an unobstructed view of the wheel. An air suspension system at the front and a hydraulically adjustable rear setup lower the bike when parked, giving it a dramatic, grounded presence.

A defining aspect of the design is the use of Pyrored accents, directly referencing the Porsche’s wheel color. The wheels of the GP-Weissach are milled from a single piece, then selectively machined after anodizing to create depth, sharp edges and visual motion. Their five-spoke Y-design appears lightweight and technical, perfectly matching the sporty and high-end character of the build. The exposed 21-inch rear wheel, combined with the perimeter brake system, serves as both a functional and visual centerpiece that underscores the precision and craftsmanship of the motorcycle.

At the end of the project, Stefan summed up his feelings in one sentence: “My goal was 100%. You delivered 110%.” For us, that is the greatest recognition. The GP-Weissach is more than a custom motorcycle. It is the translation of supercar performance philosophy into hand-built motorcycle culture. A Porsche created for the racetrack, and a Harley reinvented to share its spirit. Two machines, one shared heartbeat of motorsport passion.

La entrada Harley GP-Weissach: Born from the Porsche GT3 RS aparece primero en DARK KUSTOM.

• Owner Stephan
• Construction Year 2016
• Engine Harley-Davidson Twin Cam 2016
• Transmission 6-Speed
• Primary NH Power
• Power 140 PS / 190 NM
• Carburator Screamin‘ Eagle EFI
• Air Cleaner Rebuffini
• Ignition Harley-Davidson
• Manifold / Muffler Thunderbike
• Frame Thunderbike Dragster
• Steering Head Tilt 36°
• Swingarm Thunderbike RS Singleside
• Suspension Thunderbike Air Ride
• Handlebar Thunderbike
• Grips Thunderbike
• Clutch and Brake Master Cylinders Thunderbike
• Forward Control Kit Thunderbike
• Fuel Tank Thunderbike
• Fenders Thunderbike
• Elektric OEM Harley-Davidson
• Headlamp Thunderbike
• Seat Thunderbike
• Front End Thunderbike 1.5° Rake
• Front Rim Thunderbike Monoblock 4.0×23
• Front Wheel Avon 130/60-23
• Front Brake Caliper Thunderbike
• Front Brake Disc Thunderbike 340mm
• Rear Rim Thunderbike Monoblock 9.0×21
• Rear Wheel Metzeler 260/35-21
• Rear Brake Caliper Nissin Perimeter 6-Piston
• Rear Brake Disc Thunderbike Perimeter 21“

La entrada Screamin ‘Eagle engine OuterLimit by Thunderbike aparece primero en DARK KUSTOM.

Black Steel Choppers has once again pushed the limits of custom motorcycle design with their latest masterpiece: Yellow Reactor.

Built entirely in-house, this bike is a bold statement of engineering, design, and raw power.

The Yellow Reactor features a radically modified frame, a muscular V-twin engine, and a futuristic stance that screams aggression. Its matte black and yellow color scheme gives it a unique identity, combining elegance with performance-inspired aesthetics.

This machine sits low and wide, with a massive rear tire that dominates the silhouette and hints at the brutal torque it can unleash. From the precision-crafted exhaust system to the custom air filter and CNC-milled components, every detail is meticulously designed. The front end features a minimalistic headlight and Brembo braking system, delivering performance to match the looks.

It’s not just a bike—it’s a rolling piece of mechanical art designed to stand out at any custom show or street corner. Black Steel Choppers continues to raise the bar in the world of custom Harley builds, and the Yellow Reactor is a perfect example of their uncompromising vision.

La entrada Yellow Reactor by Black Steel Choppers aparece primero en DARK KUSTOM.

Custom parts

• Thunderbike Vegas Cut wheel
• Thunderbike Pulley Vegas polished
• Thunderbike Pulley brake system
• Thunderbike brake disc Floated Vegas 340mm
• Thunderbike brake disc Floated Vegas 292mm
• Thunderbike brake calliper adapter 300->340mm left black
• Thunderbike brake calliper adapter Radial 300/340mm left
• Brembo M4 Radial brake calliper front left 108mm black
• Thunderbike rear fender GP-Style 260 mm
• Thunderbike side license plate holder Medium Pro black
• Thunderbike license plate holder Inside Plate
• Thunderbike license plate lighting
• Thunderbike reflector Inside Plate
• Thunderbike custom aluminum tank GP-Style
• Thunderbike tank mount black
• Thunderbike front spoiler GP Style Long
• Thunderbike front fender steel 21”
• Thunderbike triple clamp Grand Prix bicolor
• Thunderbike clip-on handlebar set Grand Prix bicolor
• Thunderbike headlamp cap aluminum raw
• Thunderbike indicator stripe LED in Aluminum housing
• Thunderbike footrest pre-installation kit black
• Thunderbike assembly kit pre-installation kit
• Thunderbike driver footrest V-Tech Design
• Thunderbike shift peg & brake peg satin
• Thunderbike grips base satin black cut
• Motogadget mo.view race mirror left
• Motogadget mo.view race mirror right
• Thunderbike toppers base
• Thunderbike clutch cover TB-S contrast cut
• Thunderbike timing belt guard black
• Thunderbike ignition cover TB-S contrast cut
• Thunderbike axle cover set rear
• Thunderbike axle cover set front
• Thunderbike axle cover swing arm left
• Thunderbike EFI cover with pressure gauge holder black wrinkle

La entrada Harley-Davidson Softail Breakout ‘Razor 6.0’ customized by Thunderbike aparece primero en DARK KUSTOM.

La entrada BSC Racing Edition ‘GT2 RS’ by Black Steel Choppers aparece primero en DARK KUSTOM.

The renowned German motorcycle manufacturer, Thunderbike, unveiled its latest creation, the TB Series, a stunning addition to their lineup. Designed with precision and innovation, the TB Series exemplifies the brand’s commitment to excellence in custom motorcycle craftsmanship.

This model adopts a bold dragster style, reflecting speed and power through its streamlined design and aggressive stance. Thunderbike has skillfully combined advanced engineering with an artistic touch, resulting in a motorcycle that captures both performance and aesthetic appeal.

The presentation of the TB Series underscores Thunderbike’s position as a leader in the custom motorcycle industry, showcasing their ability to push boundaries while maintaining a distinct identity. Motorcycle enthusiasts and critics alike have praised this new release for its remarkable blend of German engineering and unparalleled style.

La entrada TB Frames Custombike ‘Dragster RS’ by Thunderbike aparece primero en DARK KUSTOM.

La entrada Walz Hardcore 63 Cycles by IMG Bikes aparece primero en DARK KUSTOM.

La entrada Walz Hardcore Cycles ‘Iceman’ by Walz Cycles aparece primero en DARK KUSTOM.

Builder BÜNDNERBIKE

• Contact @buendnerbike
• Country Switzerland
• Model H-D Breakout
• Style Dragster

TECHNICAL DATA

EQUIPMENT HIGHLIGHTS

• Bündnerbike: Frame Original H-D steering head modified
• Bündnerbike: Tank
• Bündnerbike: Tank cap recessed and keyless
• Bündnerbike: Electrical box
• Bündnerbike: Rear fender with LED
• Bündnerbike: Front fender
• Bündnerbike: Saddle plate
• Bündnerbike: Oil tank
• Bündnerbike: Fork bridge
• Bündnerbike: Handlebars with displays
• Bündnerbike: Internal throttle
• Bündnerbike: Electronics

SOUND

Everything legal
The Kess Tech flap exhaust system is equipped with an electronic sound control. This means that the exhaust tailpipes not only offer an impressive acoustic experience, but are also legal.

BRAKES & CHASSIS

Accessories: Handlebar fittings PM
Accessories: Foot fittings PM
Accessories: Front brake PM
Accessories: Rear brake PM
Accessories: Air suspension
Bündnerbike: Front rim 3x+18 inches
Bündnerbike: Rear rim 10.5×18 inches
Bündnerbike: Pulley

PAINTING & COATING

Multi-coloured paintwork with a base colour in bright red, accentuated by elegant black and grey applications. This paintwork gives the bike a dynamic and appealing aesthetic that looks sporty and sophisticated at the same time. The vibrant red base colour draws attention, while the black and grey accents create subtle contrasts and perfectly balance the design. This carefully selected colour combination gives the vehicle a unique and stylish character.

La entrada Harley Softail Primal Force ‘Radical N2S’ by Bündnerbike aparece primero en DARK KUSTOM.

Builder BLACK-STEEL CHOPPERS

Contact @black_steel_choppers

Custom painting Air-Philippe

Country Austria

Model BSC Racing

Style Dragster

Unleash the Power: Introducing the BSC Racing Edition ‘Dark Force’ Motorcycle by Black-Steel Choppers!

Rev up your adrenaline with the spectacular dragster style of the BSC Racing Edition ‘Dark Force’ motorcycle, straight from the heart of Austria.

Crafted by Black-Steel Choppers, this beast is a true marvel of design and power.

Wrapped in an alluring matte black color, the ‘Dark Force’ commands attention with its sleek and fierce appearance.

But what truly sets this machine apart is the mesmerizing airbrush work by Air-philippe, elevating it to a work of art on wheels.

The ominous black rims add to its mystique, giving it a sense of raw power and sophistication. And let’s talk about the handmade exhaust system—meticulously crafted for optimal performance, it delivers a symphony of power with every throttle twist.

For those eager to get their hands on this masterpiece or learn more about this engineering marvel, contact us at [email protected]. Experience the thrill of riding the BSC Racing Edition ‘Dark Force’ and embrace the road like never before!

La entrada BSC Racing Edition ‘Dark Force’ by Black-Steel Choppers aparece primero en DARK KUSTOM.

Builder VIDA LOCA CHOPPERS

Contact @vida_loca_choppers

Country Switzerland

Model TB frames

Style Dragster

La entrada TB Frame Dragster ‘Jaws’ by Vida Loca Choppers aparece primero en DARK KUSTOM.

Builder Tarso Marques

Contact @tarsomarquesoficial

Country Brazil

Model Harley-Davidson

Style Dragster

La entrada Harley-Davidson Drag Style by Tarso Marques Concept aparece primero en DARK KUSTOM.

Walz Hardcore Cycles from Germany presents the Legacy, a Milwaukee Eight motorcycle with a dragster-style modification.

This spectacular and striking bike boasts a captivating red color, showcasing the continued saga of innovation and design excellence at Walz Hardcore Cycles.

The LEGACY marks a new chapter in the rich history of the company, pushing the boundaries of motorcycle engineering and design.

With its 114 cubic inch Milwaukee 8 engine, this 2021 model complies with Euro 5 emission standards and delivers an impressive 95 horsepower.

What’s remarkable is that it achieves these eco-friendly standards while still providing an exhilarating sound, thanks to its Dr. Jekill & Mr. Hyde exhaust system.

Safety is also a top priority, with the LEGACY featuring an anti-lock braking system (ABS) to meet the stringent requirements of the German TÜV, making it street-legal in most countries.

La entrada The LEGACY, a dragster-style modification aparece primero en DARK KUSTOM.

The PROTOTYP is a truly unique and exceptional bike, with its modified frame and gastanks, as well as its abundance of handcrafted custom made gold and carbon fiber parts.

This bike surpasses all previous WHC bikes in terms of its outstanding design and features.

Drawing inspiration from the renowned sports car brand ‘Lamborghini’, the design of the PROTOTYP revolves around sharp edges and hexagonal shapes. Combined with the iconic Walz Hardcore Cycles dragstyle appearance, this bike truly stands out as a ‘One of One’ creation.

One of the standout features of the PROTOTYP are its custom made wheels. These wheels are meticulously crafted, with various elements milled out of aluminium.

The blossoms, bolts, and brakediscs are all plated with 24K gold, while the rims are coated with forged carbon fiber. This gives the wheels an elegant and luxurious look, especially when illuminated by sunlight.

Underneath its stunning exterior, the PROTOTYP is powered by a combination of a S&S engine and a Rotrex supercharger.

It also boasts a built-in NX system, a custom welded exhaust, and a 6-speed transmission. This driveline not only enhances the bike’s beauty, but also provides immense power and performance.

Similar to most motorcycles, the PROTOTYP can be started by pressing a ‘START’ button. However, unlike other bikes, the PROTOTYP features an original ‘START’ button from a Lamborghini Aventador. This button is integrated in a custom carbon fiber housing, situated on top of the main frame next to the NX system switch.

In conclusion, the PROTOTYP stands out as the most outstanding WHC bike created to date.

Its unique design, inspired by Lamborghini, is accentuated by the abundance of custom made gold and carbon fiber parts. With its powerful driveline and luxurious features such as the custom wheels and Lamborghini Aventador ‘START’ button, this bike truly redefines excellence and sets a new standard in the world of motorcycles.

La entrada PROTOTYP: Iconic Walz Hardcore Cycles dragstyle aparece primero en DARK KUSTOM.

The Imola is a direct relative of the Mugello and Silverstone and probably the most daring machine in the Thunderbike racing series.

Thunderbike parts

La entrada Harley-Davidson Breakout “Imola” by Thunderbike aparece primero en DARK KUSTOM.