I know this is an old, like me, thread...and John Hurdy has probably answered this for me before; but I swear I had seen somewhere some had tested how much HP can be made using the stock air-box and performance filter with the EA113 engine. Anyone seen this discussed or know first hand? Not really seeking guesses, I just respond to some asking this question with "I believe I recall some saying near 400 BHP, but not actually able to get to 400." I would like to have my memory refreshed...thank you.