@ delviavc2 ...are you talking about AFE stage 2 cai?.
i just saw the thread......I do feel the difference...but not much....anybody has tried " Sprint Boosters" from ECS?..$299...let me know..still thinking if i could see or feel a FULL open throttle

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Past
2000 E46 325i
2006 E53 4.4i Sport
2006 X5 4.8is
2011 E90 328xi
2011 E71 50i Fully Loaded :thumb up:
Current
2000 E39 528i
2013 F10 M5
2013 F10 535xi
2017 X3
2017 Sedona
2017 Optima
2016 Fiesta