(i learnt a lot of this on american civic sites)
basically its nothing like F&F, No buttons or anything like that, Instead you have a computer mounted on your dash that will tell the system when to engage and dissangage (such as during gear shifts)
It doesnt give you a sudden burst of speed, the best way to describe it is that its kinda like a hondas Vtec system, At around 4k RPM the computer will kick the system in you will feel a sudden increase in performance, However its not enaught to make the world go blurry, Basically it will feel just like your car just got a 100BHP performance increase while moving. Sorta like a turbo but not a subtle and no spool up times.
Then you have to ask your self what sorta system you want
Dry shot
Wet Shot
Direct port N20