Icarus Armor

The Icarus Armor is found in Mega Man X8. It can only be used by equipping the Neutral Armor with all four I-Parts. In addition to the cumulative effects of the four parts, the Icarus Armor supplies X with the ability to perform a Giga Crash, a full-screen attack. The Giga Crash gauge fills up over time. Unlike in previous games, the Giga Crash can be activated at any time, but if it is not fully charged, it has lesser range and is less powerful.

Helmet Part, in Gravity Antonion's stage: After the mini-game where your character avoids spiked blocks, look for an extra green portal in the room next to a spiked vertical passage. Axl's Runnerbomb transformation will make this easier.
 * While jumping, a blue field surrounds X. It can damage enemies, but disappears while X descends.

Body Part, in Earthrock Trilobyte's stage: You need one of Burn Rooster's weapons. After whacking the mini-boss in the head, follow it as it retreats. A rock wall that was once there should be gone, and the corridor leads to several fuel tanks. Attack them with Burn Rooster's weapon, and take X to the capsule.
 * Halves the damage X takes, and removes all recoil. All health X loses turns red, meaning he can be switched out and in and recover all of his health.

Arm Part, in Noah's Park: While beginning the game, there is a locked door near the middle of the stage. Enter it on a second playthrough to find the capsule.
 * X-Buster shots need to be charged one less level than normal. For example, his normal shots become Level-1 charged shots, and Level-2 charged shots become Level-3 charged shots. The maximum charged shot becomes a powerful laser.

Leg Part, in Bamboo Pandamonium's stage: Pick up the Ride Armor, your character will need to get it to the next section of the stage (hop out of it on the moving spikes, then run over the ledge and jump in on the other side). In the next section, you will see a ledge that you have to raise using a button. Raise the ledge with the armor standing on it, then get in the armor and jump and air-dash to the left. Jump out of the Ride Armor at the last second and the character should barely clear the spikes.
 * Doubles the height of X's jump.