After about 4 days of owning the acura I am already thinking of adding some must have mods. But I'd prefer to have opinions/recommendations. Also it'd be nice to see the range of how much something like a CAI, Headers etc. will cost to buy and get it installed at dealership and what kind of effect it will have on the car. Would it be obnoxiously louder? I'm very new to Acura or Hondas in general. Oh and it's a '03 TL-S