Civic EG

hi guys. what's difference? how much will it affect the hp the hatch?

I think you're gonna feel a bit of difference, only because I'm assuming the P30 is still stock, and if you add a Mugen chip more then likely the fuel map is going to be set to lean, and the timing is going to be a little more advanced, hence the feeling of more power. But aside from that, that's all the difference you'll notice, I don't think it's car specific, however I do think it's engine specific as not all engines are created equal.