I need help, i ran subaru outback 2.5 without oil

Hello there, i'm so worry right now because i just ran my
subaru outback 2.5L without oil i didn't notice that the car
was burning the oil because it doesn't have any kind of leak
and i was so confidence with my car maintenance cause it
just passed the state inspaction last week. So i was runnin
and car made a really wierd sound some kind of blow and
then the light of check engine was on and the cruise was
flashing and also turn the oil light and inmediately i stop the
car. i waited until the car got cold and i added  almost 4L of
oil, the lights went off, but i feel the car really slow i have to
step on the gas to make it go fast, it doesn't have any kind
of smoke coming out of the exaust. What do you think
about it? Should I change the oil and filter again to see how
the car goes? I have to mentioned that i added now to
much oil because the car was empty but went i started now
its way up the oil like a quarter up from the regular amount.