Hi CJ, the FI on quads compensate for altitude and temperature but not for added air flow, hence the need of the PC3 or Dobeck type controller. If you only change the stock filter for the Uni you should be fine, it's when you take the lid off, remove baffle, add an aftermarket exhaust, etc that the controller becomes a must.
2006 Raptor 700
Yoshi RS-7 full, PCV, Pro Design Foam, EHS lid, Flexx bars, 2" Rox antivibe risers, ASV C/5 levers, Powermadds, CCP stabilizer, HDUSA i3500 +2 a-arms ST, Rap 700 SE front shocks revalved/resprung by Wiigstyle, Fox Podium X rear shock, DWT Drift rear beadlocks, Hiper front beadlocks, Pro Armor XC nerfs and Race grab bar, Tag Agro bumper and railer chassis skid, PRM 0.25" swingarm skid plate
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My name is IŮigo Montoya, you killed my father, prepare to die!!!