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Computer Programable Dyna Ignition. After you hook one up you can run it as is, or you can get the disk and plug it into a cumputer and peak and turn your quad. Let say you need more power though your mid range you plug it in and adjust it. you can also tune you rev limiter install a launch limiter with it. And it has a little switch it has a stock setting and settings 2-4. 4 being you highest setting. lets just say you playing around the yard you set it on stock but when you wanting to race you put it on number 4 setting for peak HP. They help your quad i could tell a big diffents. but there not cheep. about $450 for box and $120 for disk.

 

Oh and how it works, It does something with your timming. It likes advances and retards it as needed.