- Whistle -> This will never go away as long as you have an aftermarket intake filter on. This is why the stock intake has a resonator to eliminate this.
- BOV -> blow off valve. Device installed on a turbo engine to relieve extra pressure to avoid overboost
- Shortram -> Get this if you are afraid of sucking up water and causes enigne hydrolock, but it does suck in hot air from your engine. Hot air is not as dense as cold air, resulting in less HP. The intake filter on a shortram is also easier to get to for cleaning.