Stringer Stacks, Variable Length Velocity Stacks

StringerStacks Electronic Variable Veloxity Stacks.

Bike Model – Yamaha R6 06-07 (2C0) (in Development – pre order now)

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.




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.
Stringer Stacks ZX10R 2016+ Dyno
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.
Stringer Stacks Grey Grommet for power cable


StringerStacks are available for the following model bikes

Aprilia RS660
GSXR1000 K9-L6 2009-2016
GSXR1000 L7+ 2017-2022
GSXR600 2011+
MV Agusta F3 800
Yamaha MT10
Yamaha R7
Yamaha R6 06-07 2CO
ZX10R 2011-2015
ZX10R 2016-2020
ZX10R 2021+
ZX636 10-22
Ninja 400
CBR1000RR 2020+
CBR600 2007-2021
Triumph 675
Triumph 765

(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.
Make Model Year
Make Model Year
Aprilla 660 RS 2021
Aprilla 660 RS 2022
Aprilla 660 RS 2023
Honda CBR-1000RR 2020
Honda CBR-1000RR 2021
Honda CBR-1000RR 2022
Honda CBR-1000RR 2023
Honda CBR-600RR 2007
Honda CBR-600RR 2008
Honda CBR-600RR 2009
Honda CBR-600RR 2010
Honda CBR-600RR 2011
Honda CBR-600RR 2012
Honda CBR-600RR 2013
Honda CBR-600RR 2014
Honda CBR-600RR 2015
Honda CBR-600RR 2016
Honda CBR-600RR 2017
Honda CBR-600RR 2018
Honda CBR-600RR 2019
Kawasaki Ninja 400 2018
Kawasaki Ninja 400 2019
Kawasaki Ninja 400 2020
Kawasaki Ninja ZX-10R 2011
Kawasaki Ninja ZX-10R 2012
Kawasaki Ninja ZX-10R 2013
Kawasaki Ninja ZX-10R 2014
Kawasaki Ninja ZX-10R 2015
Kawasaki Ninja ZX-10R 2016
Kawasaki Ninja ZX-10R 2017
Kawasaki Ninja ZX-10R 2018
Kawasaki Ninja ZX-10R 2019
Kawasaki Ninja ZX-10R 2020
Kawasaki Ninja ZX-10R 2021
Kawasaki Ninja ZX-10R 2022
Kawasaki Ninja ZX-10R 2023
Kawasaki Ninja ZX-6R/636 2010
Kawasaki Ninja ZX-6R/636 2011
Kawasaki Ninja ZX-6R/636 2012
Kawasaki Ninja ZX-6R/636 2013
Kawasaki Ninja ZX-6R/636 2014
Kawasaki Ninja ZX-6R/636 2015
Kawasaki Ninja ZX-6R/636 2016
Kawasaki Ninja ZX-6R/636 2017
Kawasaki Ninja ZX-6R/636 2018
Kawasaki Ninja ZX-6R/636 2019
Kawasaki Ninja ZX-6R/636 2020
MV Agusta F3 1999
MV Agusta F3 2000
MV Agusta F3 2001
MV Agusta F3 2002
MV Agusta F3 2003
MV Agusta F3 2004
MV Agusta F3 2005
MV Agusta F3 2006
MV Agusta F3 2007
MV Agusta F3 2008
MV Agusta F3 2009
MV Agusta F3 2010
MV Agusta F3 2011
MV Agusta F3 2012
MV Agusta F3 2013
MV Agusta F3 2014
MV Agusta F3 2015
MV Agusta F3 2016
MV Agusta F3 2017
MV Agusta F3 2018
MV Agusta F3 2019
MV Agusta F3 2020
Suzuki GSX-R 1000 2009
Suzuki GSX-R 1000 2010
Suzuki GSX-R 1000 2011
Suzuki GSX-R 1000 2012
Suzuki GSX-R 1000 2013
Suzuki GSX-R 1000 2014
Suzuki GSX-R 1000 2015
Suzuki GSX-R 1000 2016
Suzuki GSX-R 1000 2017
Suzuki GSX-R 1000 2018
Suzuki GSX-R 1000 2019
Suzuki GSX-R 1000 2020
Suzuki GSX-R 1000 2021
Suzuki GSX-R 1000 2022
Suzuki GSX-R 1000 2023
Suzuki GSX-R 600 2011
Suzuki GSX-R 600 2012
Suzuki GSX-R 600 2013
Suzuki GSX-R 600 2014
Suzuki GSX-R 600 2015
Suzuki GSX-R 600 2016
Suzuki GSX-R 600 2017
Suzuki GSX-R 600 2018
Suzuki GSX-R 600 2019
Suzuki GSX-R 600 2020
Suzuki GSX-R 600 2021
Suzuki GSX-R 600 2022
Suzuki GSX-R 600 2023
Triumph Daytona 675/R 2006
Triumph Daytona 675/R 2007
Triumph Daytona 675/R 2008
Triumph Daytona 675/R 2009
Triumph Daytona 675/R 2010
Triumph Daytona 675/R 2011
Triumph Daytona 675/R 2012
Triumph Daytona 675/R 2013
Triumph Daytona 675/R 2014
Triumph Daytona 675/R 2015
Triumph Daytona 675/R 2016
Triumph Daytona 675/R 2017
Yamaha FZ-10/MT-10 2016
Yamaha FZ-10/MT-10 2017
Yamaha FZ-10/MT-10 2018
Yamaha FZ-10/MT-10 2019
Yamaha FZ-10/MT-10 2020
Yamaha YZF-R6 2006
Yamaha YZF-R6 2007
Yamaha YZF-R7 2022
Yamaha YZF-R7 2023