Manuel V;      Great product, greatly reduces engine vibrations, improved throttle response and torque. Terry H; My bike runs better and it's definitely an improvement from the stock CDI. Raymond F; One of the best performance mods I have done yet. Recently had to go back to stock CDI after I somehow got CDI wet, forgot how huge a difference it made until it wasn't there anymore, smoothed out engine vibration drastically gave huge low and high range boost. Not exaggeration adds easy 6mph to my cruising speed and the acceleration is drastically improved ordering a new one this week can't picture riding without it. Lorenzo W;      I have been using the jag CDI with the performance expansion chamber exhaust and i tell you the difference is night and day from the stock. Clueless when it comes to the technical stuff I just know that it has: Reduced the vibration added around 5 mph to the top speed which is now around 45 mph throttle response is immediate holds 30 uphill I love it Seth Y;      All I can say is....WOW...big difference once you find out what curve you need it set on for your motor…I would recommend this as a must have for your bike. Kyle H; This item does what it says on the box, gives a smoother running engine with better spark. Using this CDI allows me now to one kick start my bike on cold days without the choke and has even given me some low end torque improvement.