As a replacement or an upgrade, either way you will not be disappointed with these bulbs. With a rating of 5000K, the Super Plasma GT-X is a great improvement over stock & will show a brilliant bluish-purple light for superior output. At a 4150K rating the Xtreme White offers a great performance upgrade showing a crisp white light while the Xtreme White Plus offers the same with a slight blue tint with no sacrifice in lighting.