Firstly I want to say, I rarely post reviews or even anything on my Social Media about my bikes or trackday exploits, preferring to stay ‘under the radar’ but I have to tell you my experience with Stringer Variable Length Velocity Stacks on my 2018 ZX10RR.
When Mike told me about the Stringer Variable Length Velocity Stacks I didn’t believe him how they would transform my bike, I’d heard of velocity stack kits that replace the stock stacks that claim big gains but in reality the improvements are barely noticeable, so I went into this modification with a pinch of salt.
However, what can I say, the difference in the bike is night and day to before we installed the stacks.
At Portimao last week I could tell it’s a massive increase on corner Exit and the other thing I noticed is the better power delivery. as in the front wheel was not coming up so high and there was a noticeable increase in the speed at the top end, which is what I wanted, I didn’t get overtaken once in 3 days and absolutely nothing could keep with me on the straights, I was astonished at how the bike leapt out of the corners and the higher midrange power allowed me to not only keep with the latest bikes like S1000RR, Ducati V4 and V4R on the straights but reeled them in passed them before turn one.
This is an absolute must do modification for any bike that doesn’t come from the factory with variable length stacks, you not only get massive increase in midrange but the better throttle response allows you to get on the gas sooner and without being more aggressive on the throttle coming out of corners. It is by far the best money I have spent v’s the improvement received in the bike. Do it now!
As a side note Mike also supplied me with new Brembo T-Drive disks and Z04 pads which has massively moved my braking markers closer to the corner over the Brembo Supersport disks I was using, despite being on treaded tyres on this trip rather than my normal slicks.
Thanks Mike!
The changes to my bike massively improved my riding, reduced my laptimes and made the Portimao trip my best ever! Can’t thank you enough – Jose
Amazing. Totally different bike! I never realised just how extreme the injector cut is when rolling off the throttle. Makes slow speed cornering much more predictable. Just all round generally easier to ride, smoother and more fun. Plus, it’s got rid of the major backfires when changing gear, now it just crackles on deceleration which sounds great. Massive fan of this service, thank you very much for the service and fast turnaround.
The (Rotobox) wheel came out looking so good on the bike and I just wanted to thank you for your time, effort, and business!!!
But before i feelt the Hayabusa as a heavy superbike and,you have to realy work with the bike in the curves,and it feelt a litle slow on the reaction to adjust it.But with the Rotobox on is much quicker to handle in the curves,and much more easier to change the angle in the curves. Just love theme,and looking forword to try theme more tomorrow.
The Hayabusa has enough power in the engine,but with theese on it is perfect to ride.
Definitely seems more responsive and tick over is more stable.
This is the second time I approached Mike @Veloxracing. (see my 1st review, White/Red RN19 4C8). My first experience on my RN19 with FTEcu was so positive, now that I have my second bike, I wanted to flash this bike myself so I can fine tune all the details to my own liking. ( I used the Mail In Flash Tune)
This tool is addictive, I must have tried 10 images already and try to keep all the best results and combine them into an image I made myself. The feedback and availability from Mike is fast, it’s almost like he is there with you!
The RN22 is not really a comfortable machine to throw around at sub 3k RPMS, but having this tool, you can really customize your experience anywhere on the rev band. Having “total” control over the ECU is a real must to R1 owners out there, I can’t say anything else to the people who aren’t using FTEcu, you are missing out.
To say I was impressed would be an understatement. Awesome would be a better discription. The power delivery right through the rev range is superb. The jerky throttle in traffic and round islands is no more.
All that is left to say is thankyou very much for a job well done. The service and speed at which you turned the job round was faultless.
Throttle response in lower gear major improvement as is the acceleration,gets up to good speed 50% faster.
The overwhelming improvement is you can now ride the bike how you want and is a lot more fun and to me that’s what it all about. Went out today with a friend on his Gs1200 and to be frank got bored following him. Many thanks.
Got the Ecu fitted and tested over the weekend.
Was able to remove the clutch jumper, which I was never happy using but made a difference, found the throttle sharper and more responsive.
One big plus I wasn’t expecting was fuel consumption, up about 5mpg!!!
I was always reading about guys getting around 50 but I struggled to get 40mpg (must be the way I ride) so getting an extra 5 is a massive difference and worth the upgrade alone. Thanks again.
This is the first time i have took my yamaha R1 out for a run since i had my ecu re flashed and hell what a difference. It is so smooth especially at low revs and town riding,the engine breaking is better when going into corners so less breaking. I find i have more confidence when riding the bike,i get more mpg and it doesn’t run as hot when stuck in traffic. Mike has done a great job,before i had the ecu re flashed i rung him up to ask what he does and what difference it would make,he was so helpful which made up my mind to have it done. So if you own an R1 get it done asap
Flashing the ECU gave me everything I was looking for without having to change the gearing. The bike now has a nice clean linear line power from low right through to the high RPM, meaning the power doesn’t kick you in the face at the higher rev range. It’s more controllable around town and will happily run at 30mph in top gear, and will pull away quickly without the need of changing down gear. U-turns and roundabouts are easily controlled without the need to use your clutch to control the bike. Acceleration is extremely smooth and quick too, you’ll get there quicker than you realise. Engine braking is much smoother especially around the country lanes.
Mike was brilliant when he flashed my bike, not realising I had an import, he went out of his way to solve this issue, and the ECU was returned very quickly. I’ve done about 500 since I had the unit flashed, and I am loving every minute of each ride, learning the way the power is delivered throughout the rev range………… It’s the best mod you can make.
I’ve just fitted it and taken it for a spin…. Jesus F’ing Christ!! It’s absolutely mental! Feels like I’ve fitted a supercharger to the bike!Just has bundles of power that weren’t there before and the midrange is unbelievable. So glad I got it done have been umming and arring about doing it for a long time now, makes a huge difference and have already recommended it to a few mates. Mike… You sir are a wizard!!!
The bike is much smoother and a joy to ride !
The paint and finish is amazing! Great product love it!
Just got the part today, looks amazing and took a few minutes to install! Thank you for such great service! Here’s a picture of how it looks.
I’m quentin of the order XXXXXX I’m super happy with the result 
thank you again
WP Wings Quality is good, nice fit 
makes the bike stand out Even more now
I have built in and tested the ECU Friday. Nice job! I will recommend you.
Best regards Stefan
A massive thank you to Mike @Veloxracing for setting up my R1 to top level standards!
After having my MT-09 flashed it has become a different bike. The main issues I had were the savage engine braking and its apparent inability to maintain a steady cruise without surging. The flash has sorted both of these out issues out as well as other improvements. The fly-by-wire is smoother and more predictable. Might need to upgrade the brakes now though.
Excellent service (both speed and helpfulness) from Mike, will gladly send my next bike for similar treatment/improvement
We had 27 degrees Celsius, and man, was it perfect riding weather.
I love how the throttle feels more “planted” on sub 3k rpm.
Every time you open the throttle, you can always expect a smooth throttle response instead of the jerky responsiveness that the bike comes with from the Yamaha.
The power is so much more usable from rolling on idle, until ~ 6000rpms (which was the RN19’s Achilles heel).
Of course, above 6000rpm, this wasn’t a tame beast to begin but the torque curve feels more linear, so the power just keeps building instead of a sudden big “push” of power above 6000rpm.
Another little bonus: Even though the bike should be runner richer, I am getting the same (actually, even a little better) mileage!
You have finished the R1 Yamaha wanted it to be.
Being a complete technophobe I had some issues with installing the software but Mike was always available to guide me through. Pound sterling per horsepower gained, it represents outstanding value for money.
So what im trying to say is the flash tune on a 4C8 is something that is absolutely a must to do. Thanks Mike
Had her almost 2 years now and to be honest I loved her since day one and adapted my riding to compensate for the snatchy throttle and other small gripes, I suppose just got used to the R1 being ‘that way’.
One thing I did not pay much attention to was the engine braking effect which the FT tweaked, I can openly say that is now the biggest plus to my riding her. Honestly the effect of having full control of the bike when coming off the gas and tipping into a bend gives the confidence a massive boost, just simpl smooth transition into any corner.
Throttle restriction removed so she is bang on the money acceleration wise hitting the red line I feel insanely quick.
Around town more reigned in with less of the clutch control to negotiate the nightmare mini roundabouts.
Just my opinion all, I’m no expert but this is a worthy investment for your ride, took me ages getting around to getting ECU FT which is far too long…do it now you will not regret it
An added bonus is that average fuel consumption went up from 45 mpg to 51 mpg on an 80 mile run. Thanks again for the excellent service and communications
The bike feels completely different now, pulls much stronger through the entire rev range. I have also noticed I seem to be getting a few more miles on a tank of petrol, can’t complain about that. I had been putting this mod off for a while and even though I have pretty much a standard setup apart from a K&N air filter the bike feels much better. I especially like the smooth throttle which makes driving in slow traffic effortless.
Many thanks for the level of professionalism and communication. I will definately recommend Velox to others
Thanks again for your help you’ve done the perfect job….
Well my feeling of the bike feeling very strong was not my imagination it seems very much like the ducati 1198sp I had acceleration wise, we carried out roll on,s in different gears to try and get some kind of comparison between the stock and the flashed and there is a significant difference in power to the point that they are all talking about your flash tune which is always good
