Would it be disrespectful or what do you think would happen if I colore my hair brown without my parents consent?

I am 16 years old, and I am a guy…My parents are very influencal on what i do with my hair and clothing, but this is something i seriously want to do, but i have a very good feeling that this is not whta my parents would suggest, im paying for it myself, and ive seen plenty of other guys my age do it. If i did, what do you think will happen? Info: I have naturally red hair.