Please note some products have increased in price due to Import tariffs
Dont wait until summer to order brembo, carbonin or other european brands because the industry closes for the month of August so resupply takes longer



These products are special order and intended for closed-course, off-road competition use only. Use of this product for any other purpose is strictly prohibited.
These are made to order unless we show inventory, please allow 1-2 weeks for delivery.
StringerStacks Electronic Variable Veloxity Stacks
StringerStacks Variable Length Velocity Stacks offer a huge performance gain and improved throttle response over stock velocity stacks (or bellmouths as they are also called) that cannot be gained from the installation of any other aftermarket products.
These electronic variable-length velocity stacks transform the bikes we have fitted them to. Our track testers have not wanted to take them back off their bikes!
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.
If your road racing or Roll racing you are not going to find a better set of stacks out there! leave your competition behind!
| SKU: | SSS17G1K |
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Item came exactly as expected super fast shipping and the quality is insanely good product is exactly as described
little slow on shipping but i was ordering parts for a 30 yr old bike. All in all good transaction informed whole way thru with times
I will definitely be contacting HHR for more products in the near future.
Nigel Gale
Looks like incredible engineered products, both the thumb brake & the rear master cylinder. On the master cylinder, be aware QNIUM use 6mm bolts where as the stock Triumph 675 bolts are 8mm. Not a big deal, just be aware.
Nigel Gale
I am really glad you have employees like MARK. He was incredibly patient. There were some bumps along the way & he made sure to communicate what was going on & kept me in the loop has to the time frame for delivery etc. Great customer service.
Mark was exactly right, the quality of this product is remarkable. Exactly as promised!!!
Such a great set of tank grips for this bike.
Works perfectly and was suprised on how easy the installation was.
Best place to buy parts, great communication,
Fast shipping, great communication
If I could give Mark and his team a higher rating, I absolutely would. They are, without a doubt, the most knowledgeable and client-focused sales team I have ever worked with. They genuinely care about the people who place their trust in them and consistently go above and beyond to ensure all of my questions are answered. Their professionalism, expertise, and commitment to making sure I feel confident in every purchase set them apart from everyone else.
If I could give Mark and his team a higher rating, I absolutely would. They are, without a doubt, the most knowledgeable and client-focused sales team I have ever worked with. They genuinely care about the people who place their trust in them and consistently go above and beyond to ensure all of my questions are answered. Their professionalism, expertise, and commitment to making sure I feel confident in every purchase set them apart from everyone else.
Very easy to install and looks nice
Worked perfectly and looks great!
Attention to the client it’s sublime
Very professional, great add to my bike and excellent service quickly delivered
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