Yeah, I'm sorry, I forgot to mention that. Pretty much what ever mod you get first will be the highest gaining one. The others will only compliment it. So if you get
CAI' @ 17.5hp
LTH @ 20hp
CBE @ 19hp
you will probably make somewhere around 40-45hp total. Me personally, I like modding the car, and I love the way it the CAI's look in the engine bay. Without them it just seems plain and empty. And a selling point to my wife is that if I didn't spend the money on my car, I would probably be spending it on coke and strippers