Number 2 Ionium Jet

The #2 Ionium Jet is a ship part in Pikmin. It probably provides a slight boost, as Olimar states, but it could easily be used for smoother flying and quicker turns. Like the #1 Ionium Jet, this is needed for the Dolphin to propel itself through deep space. In Pikmin 2, the Massage Girdle is in its place. Once recovered, this Ionium Jet is installed on the port side of the ship's hull, level with the main hatch (it is to the back and left of Captain Olimar when he is seated).

Although there is no part with this name in Olimar's Shipwreck Tale in, the Ionium Jet in the Blossoming Arcadia is analogous to the #2 Jet in appearance and function.

Collecting the part
It is on a stone platform in the far north of the area. To retrieve it, first throw at least 15 Blue Pikmin onto the platform to the west of it, and use the nearby geyser to reunite with them. Then simply throw them across the gap to the Jet. The path to the ship from there is full of Water Dumples, Dwarf Bulbears and Spotty Bulbears, so be sure to clear the path before taking this piece.