This turbo is a bolt on upgrade for the 2016+ Honda Civic Si from the makers of the original OEM turbocharger. MHI is the original manufacturer of the turbo on your Civic Si, so you can trust them to make a quality bolt on turbo upgrade.
This turbo uses a 49mm compressor exducer, compared to the original 46mm compressor exducer. It is paired with a 40mm turbine wheel with less blades for more flow. This creates a unit capable of 260hp using factory fueling, and more when correct upgrades are made.
Note: It is imperative that you use 10W-40 oil or higher when you install this turbocharger.