hi, an air raid is when bombs fire at you basically
Anything is better than stock. Personally, I'm a fan of K&N. People also seem to like the AirRaid and MOPAR CAI setups. The choice is pretty much up to how you want it to look under the hood.
Several ways. Cut out the suitcase portion of the exhaust, install a better air filter/setup (K&N, AirRaid, etc), get a tuner for the engine (Diablo, etc) -- don't get a chip, they don't allow any customization after purchase and can't be removed. Those are the relatively cheap options. some of the more expensive (and fun) options include forced-induction, like a Super- or Turbo-charger.
AnswerFirst you can add high performance mufflers i.e. Cherry Bomb glass pack. Turbo muffles are not as low but still rumbel. Remove the reasonator and replace with a straight exhaust pipe which costs about $5.50. If you want to go all out, add headers.