As modern-day track toys go, power and weight are the two critical ingredients in building the perfect track racer. The KTM X-Bow already has the power to go with being very lightweight so by its sheer existence, it’s already fit to do some serious damage on the race track. But Wimmer RST has a better proposal. Why not add more power to the X-Bow and also make it lighter? Seems like a good idea, right?

Well, that’s exactly what the German tuner did with its new program for the X-Bow. The kit itself covers a lot of bases to help the track car improve on numerous fronts. For instance, Wimmer installed a carbon fiber aero kit to shave off precious weight off of the car. It also beefed up the racer’s suspension setup, and most importantly, it was able to squeeze out extra power out of the X-Bow’s 2.0-liter turbo four engine.

The result certainly speaks for itself. That massive rear wing on the X-Bow is both a treat to eyes and to the car’s overall performance character. It’s only fitting that Wimmer is responsible for this kit. The tuner, after all, is the German retail partner and type A dealer of KTM Sportcar GmbH. Working on the X-Bow is old hat for the Wimmer. After all, it’s already done a couple of programs for the KTM racer.

The only thing different about this version, called the X-Bow R Limited Edition, is that only three of them will be built. That’s called exclusive with a capital ’E’.

Continue reading to learn more about the KTM X-Bor R By Wimmer RST.

  • 2015 KTM X-Bow R By Wimmer RST
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Wimmer RST’s previous work on the KTM X-Bow gives us an indication on what this new kit is all about. The exterior, in particular, is once again defined by an extensive aerodynamic kit made up of high-strength carbon fiber parts. The spoilers, rear wings, air box, and the aero parts around the exhaust unit of the X-Bow are now made from carbon fiber to help the track car shave off precious weight to aid its performance capabilities. Likewise, the standard underbody material of the X-Bow has been replaced in favor of an aluminum composite version. The use of these two materials helps the track car achieve a weight of just 1,740 pounds. Wimmer RST also replaced the X-Bow’s standard tires with a new set of lightweight Taneisya forged wheels wrapped in Toyo semi slick tires


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Considering how spartan the interior of the X-Bow already is, there was no need to completely turn it upside-down. Instead, Wimmer focused on the safety essentials by reinforcing the crash box and installing components like a navi-system holder and a racing draft shield to help ensure the safety of the driver and passenger. Other than these bits and pieces, the cabin of the tuned X-Bow is as simple and track-focused as any of its “standard” contemporaries.


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The most important part of Wimmer’s new program for the X-Bow is the engine upgrade. Using the same 2.0-liter four-cylinder turbocharged engine that can be found on the standard lot, the German tuner tweaked the output from the standard 300 horsepower and 293 pound-feet of torque all the way up to 375 horsepower and 367 pound-feet of torque. That may not look like a lot for a standard sports car, but for a ultra lightweight track car, that output increase is a pretty big deal.

Performance numbers were also affected with the improvement in power. With the mods in place, the Wimmer-tuned X-Bow can sprint from 0 to 62 mph in just 3.3 second and 0 to 124 mph in just 11.2 seconds. The German tuner didn’t say how fast the X-Bow can go with the modifications, it’s not a reach to think that it can break 140 mph without much effort.


As impressive as the kit is, there’s one glaring problem about it. Wimmer says that it’s only modifying three units of the X-Bow with this particular program. That effectively makes it an ultra limited edition that comes with a price tag that suits its billing. Anybody looking to score one of the three Wimmer-tuned X-Bows will need to pony up €99,999 for one. That’s roughly around $106,000 based on current exchange rates.


Ariel Atom 3S

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The Ariel Atom 3S is insanity pushed to a whole new level.

The KTM X-Bow belongs in a market that has no shortage of rivals. That’s how far the track race car segment has grown in the past few years. From where it was a few years ago, this market already features models like the Ariel Atom.

The Atom has undergone numerous iterations over the years, but whatever shape or form it comes in, it’s still considered the purest competitor the X-Bow has. The latest version of the Atom is called the 3S and like most Atom’s, the 3S packs a very powerful punch.

Granted, the Atom 3S isn’t really as powerful as its V8 sibling, but it still features a 2.4-liter turbocharged Honda engine that produces 365 horsepower, nearly as much as the Wimmer-tuned X-Bow. The kind of power helps the Atom 3S to sprint from 0 to 60 mph 2.8 seconds. Equally impressive is that it only takes 10.7 seconds to finish a quarter-mile.

The Atom 3S is available in the US with a starting price of $89,975, making it a little more affordable than the tuned-up X-Bow.

Read our full review on the Ariel Atom 3S here.

BAC Mono

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If budget isn’t a problem for a customer looking for his perfect track toy racer, the BAC Mono should be worth a serious look. Like the X-Bow and the Atom 3S, the updated version of the Mono is lighter and more powerful than its predecessor.

Most of its design hasn’t changed since it debuted in 2011, but BAC does have the ability to customize the Mono with a high-strength carbon-fiber-composite body to go with a front carbon-fiber crash box. Likewise, power comes in the form of a Mountune-sourced 2.5-liter, four-cylinder engine that pumps out an impressive 305 horsepower, helping the car sprint from 0 to 60 mph in under three seconds to go with a top speed of 170 mph.

Of the three track racers, the Mono has the biggest potential to excite, thanks in large part to all the carbon fiber goodies BAC used in it. But that comes at a price, quite literally, too, as the Mono traditionally fetches a price tag north of $120,000.

Read our full review on the BAC Mono here.


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The Wimmer-tuned KTM X-Bow has all the trappings of a track stud. The aerodynamic upgrades provide a significant improvement in handling, something that will come in quite useful with the accompanying engine update of the program. That rear wing, in particular, looks positively gnarly. Not only does it give the X-Bow a more menacing look, but it’s also a very important purpose. Points also go to Wimmer for stiffening up the X-Bow’s suspension to make it more in-tune with its track day capabilities. Same with the power improvement. It’s not a lot compared to what we’ve seen in the past from other tuning firms, but given the car’s weight and stature, it should be enough to turn the X-Bow into a rocket launcher.

My only concern is availability. Surely, Wimmer is capable of building more programs like this if it wanted to. But limiting it to just three units? Seems like it’s really taking that exclusive label to heart.

  • Leave it
    • Why limit it to just three units?
    • There are other options available
    • Not suitable for everyone

Press Release

Besides serial data optimization (chip tuning), WIMMER Racing Sports Techniques also all other areas of measurable car performance uprating are core business of the Solingen Company. The racing sports exhaust systems of own production, chassis techniques and sports brakes and clutches are daily challenge to keep and to improve service quality. The company own performance test stand allows graphical documentation of indeed reached total power improvement measurements. The Solingen tuning experts fit the data optimally to a lot of power improving features under most modern conditions with company own software.

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As well known, WIMMER RST is also the German retailing partner and type A dealer of KTM Sportcar GmbH, offering in this capacity a.o. the KTM X-Bow R Limited Edition in small series consisting of three exemplars. The matter here is of the absolute premium league original KTM-X-Bow model 2015 with a lot of special features. The racing car with road approval is a full carbon fiber extreme driving machine with 380 HP and 500 Nm after Wimmer power “cure” (serial power 300 HP and 400 Nm) at 790 kgs of weight only. The resulting acceleration from 0 to 100 kmph (0 to 50 mph) within 3.3 seconds is adventure feeling pure, 0-200 kmph (0 to 120 mph) within 11.2 seconds...

The ultra light and, in the same time, carbon fiber made high-strength auxiliary parts, such as rear wings and spoilers, air guiding elements, aero-parts around the exhaust unit, racing wheel caps, KTM Performance kit no. 2 with carbon fiber air box and racing sports underbody in aluminum composite, including front splitter and rear diffuser, lend the bolide an at all particular look.

As tires have been chosen mounted on Taneisya forged rims Toyo semi slicks. The KTM racing chassis with expansion tank and adjustable prestress of traction and compression stage, distance discs on rear axle, Brembo sports braking system with fixed caliper and adjustable brake bias for most extreme braking performance, “R”-specifically reinforced stabilizers, suspension arms, gear box performance support and adjustable push rods make the X-Bow R really “glue” on asphalt.

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The CNC milled gearshift serves to chose the shortened gear steps in the reinforced gearbox, where at the KTM shift travel reduction helps additionally.

As specialized manufacturer of stainless steal sports exhaust systems, WIMMER RST, of course, strives to make optimizations also in this area, in fact with a black two stage KTM exhaust system.

Safety aspects have been also materialized by means of monocoque and crash box. Other no less interesting details are: Air guiding elements, light construction racing panels in the specific “R-design”, Keyless Go with two radio remote keys, KTM side drops, complete car cover interior, aerodynamics kit no. 2 (air flaps and flics), navi-system holder, racing water pump, additional gear box oil cooler Racing type, big fuel pump in the tank, big high performance pump and, finally, the racing draft shield. As we can see, WIMMER RST has drawn on nearly unlimited sources. Nothing leaves to be desired – nor in fields of techniques, neither in view of the optics.

For a price of 99,999 Euro you can take place in one of the Recaro Premium Racing seats, take the real leather made steering wheel in your hands and feel extreme driving fun. For more information concerning KTM X-Bow R Limited Edition and the whole product portfolio of the Solingen Company, please contact directly

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