as you are exposing your engine to more dust.
2) Silent Jet Cold Air Induction
Not sure. Could be one of different open/close pods / technique used
3) Direct Air Intake
Not sure. Could be one of different open/close pods / technique used
4) Hyper Direct Air Intake
Not sure. Could be one of different open/close pods / technique used
5) Open Pod with CAI
Open Pod usually involves changing to aftermarket piping and filter which replace the original stock air filter, air filter box. The filter usually looks like the shape of a cone. There is no point just doing open pod without CAI as since it is in your engine bay, it is sucking hot air. The hotter the air is, the less power your engine can generate. That is why a CAI piping is added to your open pod. However, please note the open pod kills power for all auto cars. For auto car, closed pod should be the choice.