Yeah, I don't know of anybody who uses Alpha-N, as this is really more for race cars that see the bulk of their TPS signal at higher throttle settings where the potentiometer is more accurate. Alpha-N works better on non-turbo engines that have lots of reversions or vacuum fluctuations that make MAP a bad choice. If you tried Alpha-N with a stock S4 TPS, then you may as well have spent your time whipping yourself with a bull whip, as that would have been more productive and less painful.