Factory SuperBike and Stringer Race Station have joined forces to introduce the Stringer Stacks, variable velocity stacks the next big thing in sport bike performance technology. Get ready to revolutionize your riding experience with Stringer Race Station’s Variable Velocity Stacks – the go-to solution for all your power woes.
Sport bike riders know that there’s nothing worse than getting left behind on the race track or losing precious seconds on the open road. With Stringer Race Station’s Variable Velocity Stacks, you can unleash the full potential of your bike and blow away the competition.
We’ve put our stacks to the test for over 2 years with the world’s top racers, including the legendary Sylvain Guintoli, a Multi FIM World Superbike Champion with Yoshimura SERT Motul. The results speak for themselves: massive power gains and better throttle response across the entire RPM range.
Our stacks outperform all other aftermarket products, including full race homologated exhaust systems. Plus, they cost less than even the most affordable stainless steel system. It’s a win-win for any rider looking to dominate the competition and enhance their overall riding experience.
Don’t settle for less than the best. Upgrade to Stringer Race Station’s Variable Velocity Stacks and join the ranks of elite riders who demand the most from their machines. Order now and start experiencing the power and performance you deserve!
StringerStacks Variable Length Velocity Stacks are printed using 3D printer technology using a carbon fuel resistant filament and they are delivered as a complete replacement stack kit coupled with an electronic motor and CPU to lift the upper stacks at a set RPM. This approach allows us to create variable stacks like Yamaha, BMW, Ducati do from the showroom and allows us to create velocity stacks that increase power and throttle response at mid and high rpm, not only giving proven gains on the dyno chart below, but this doesn’t tell the whole story, in real-world use – where unlike on a dyno – the ram air into the airbox is properly fed, thus getting horsepower and torque gains and throttle response that cannot otherwise be achieved with bike modifications at this price point.
StringerStacks Variable Length Velocity Stacks are a DIY plug and play installation, Stringer Stacks come complete and ready to install, if you have retained your smog/AIS/PAIR valve system then you should select the airbox installation kit, this comprises a grey rubber bung and a hole cutter to feed the electronics from the CPU to the stacks, customers who have removed the smog/AIS/PAIR system can run the cables through that bunghole.
StringerStacks are available for the following model bikes
GSXR1000 K9-L6 2009-2016
GSXR1000 L7+ 2017-2022
MV Agusta F3 800
Yamaha R6 06-07 2CO
(if your bike is not listed then please Contact Us as we are looking to add more bikes we cover)
Here is a really nice review by the 2014 FIM WSBK Champion, current Suzuki MotoGP test rider and FIM EWC racer and BTsport MotoGP pundit Sylvain Guintoli
The creator of these products, Ray Stringer from Stringer Race Services as spent the last 24 months developing and testing the stacks on the bench through millions of activations and in BSB Supersport onboard Moto2 bikes for the entire 2021 race season, they are proven to be extremely reliable with zero failures in testing, furthermore, the CPU is enclosed in a vibration and waterproof housing and can be mounted on the fork leg (for ease of access to the test button) or under the seat or tank. We warranty the product to be free of defects on delivery, as they are race products there is a limited warranty, but all parts are covered by a 12-month manufacturing defects warranty.
StringerStacks are intended for high-performance sports bikes, they are intended for race use, Stringer Race Services, nor Factory Superbike do not accept any liability from damage or injury from the installation or use of these performance products.
Custom 3D Printed Item Policy
- All items are custom made to order and may take a few days to a couple months to produce, depending on the complexity of the design.
- Once an item is ordered, it is yours and cannot be canceled or refunded.
- All items come with a one-year warranty.
- There are no refunds for any reason, including legal or personal reasons.