Hello everyone. I recently purchased an S5, it should be arriving late this week and I am quite excited. My question is though, will more power be needed? I am coming from a stage 2 STi (Turbo back, intake tune). I've been doing quite a lot of research and I'm seeing many of the numbers are matching stock STi's. What performance parts will add power, but keep the car looking and sounding as stock as possible. I was trying to find a tuner, but couldn't. Also all of the catbacks seem to be very loud. I sold the STi for a reason, if you know what I mean. Thank you for any assistance.