please boys who can tell me what to do or change on my civic 2000 150i luxline to get better performance you know diy stuff that wont be too much and what will happen when i replace my injectors with 550cc ones

 

bolt on stuff start with cams and exhaust. bigger injectors means better fuel pump for top perf. don't have to but it would be a good idea. also new intake would help too.

 

For a 2000, I would definitely say your mods start out with an intake, maybe headers, and an exhaust system.
I primarily take the condition of my car, so I only use the aftermarket to make my strain on the car less.
In performance injectors can be helpful but especially little things like an intake can really help running smooth and performing well.