After reading countless opinions on whether or not to get software for an S4 which is naturally aspirated, I decided to do it. Yes it's pricey ($550 plus tax) but I feel it made my car a lot smoother. Maybe it doesn't give me much more power but I noticed it shifts a lot quicker and smoother (tiptronic). There is no more hesitation and the car pulls through all gears, especially very hard in sport mode. Also, I feel that the car sounds a little deeper but that could be my imagination. This is the first mod I've done and am happy. I reccommend getting the Unitronic software and even if you don't like it there is a 30-day refund policy. To me the car now drives how it should. If you have an automatic S4 then you know what I'm talking about. No more lag. Hope this helps anyone thinking about making the move.
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