I honestly wouldn't mod it, performance wise. At all....
It's your first car, the 1.6 to you is going to feel like a rocket ship, your going to be the next Colin McRae, and it's got a good chance of being stacked. Especially if your Dad owns a 180 and you want to try and go as fast as his does.
Save your money, get a year or 2 experience then buy a 120 which I read accept mods pretty damn well.
I know I sound harsh, but I'm 22 and know exactly where your coming from AND you even sound similar to me when I was your age.
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