I have a question to this forum outside of switzerland. A friend and me are owner of impreza wrx 2009 subarus with 230 HP. We plan to remove the cat from the up-pie. Here the questions we have:
1. Is it easy the remove the cat from the pipe?
2. Is there an "Lambdasonde" in the cat, if yes do we have to replace it
or what is to do with it?
3. Ho many additional PS do we get, after the modification?
Thanx for your answers and regards from switzerland