Hey guys thanks for all the help. I am pretty sure that it will be o2 sensors as when I took it to subaru after having exhaust and tune done to have a hose and seal tightened they were saying how shocked there were that is hasnt thrown and engine light. They were saying that sensors seem to be in the wrong place or missing on the invidia q300 tbe.

Ok just got a call from subaru. It was a cat code, both the o2 sensors have been place infront of the cat so its not getting a reading to say that the air is getting better on the way out. Will have to take it back to where I got tbe put on and see what they can do.