The GT-X provides an exclusive purple beam along with greater performance over standard bulbs. And if it weren't enough, PIAA has added a purple top coat giving the headlamp a purple look even when the lamp is turned off.
H4 Super Plasma Gt-X Single Halogen Bulb installation instructions
<p>I live in pothole city and occasionally go off road. I need vibration and shock resistant bulbs just for my everyday normal driving routine. I replace all my bulbs at least twice a year before I tried piaa. Worth the money. Love this stuff.</p>