Quote Originally Posted by beeza View Post
Personnally I would have another bung made for the 02 sensor where the 2 pipes go into 1.That way the 02 sensor reading is of the 4 cylinders,not just 2 (where it is now).That way you have a true-er reading.
It wont make any difference whether it's reading 2 cylinders or 4 cylinders..... it's only a narrowband oxygen sensor

Quote Originally Posted by redmugenjazz View Post
yea i think the old owner stuck the sensor to read less oxygen (1/2) of what is actually released from the engine output so the ecu thinks the engine is running lean so it adds more fuel = more power? (correct me if i'm wrong, it could be the other way round = fuel economy wise?)
FYI you make more power from running leaner and it doesnt read any different being where it is atm