Share some pictures and please read the link CHILD posted, id appreciate it if you did.
But yeah post some pics and give us more info, i have the patience to guide you through some ideas, so take my offer up and help me help you.
Power from a d16y7 will be too costly, its not worth it.
Headers? Sound
Intake? Sound
Exhaust? Sound
Thats all they really are, a deaf person could drive in a civic without those mods, then drive in another with all those mods and will not notice the difference. (Because there isnt any)
You got a honda CIVIC, (civic meaning civil/civilian, its an economical civilian car) not a racecar. Focus more on saving money and higher MPG (miles per gallon numbers) than HP (horsepower)