Yes. I've heard that as well. It seems like people don't agree on this subject.
Anyone with some dyno figures to support either side?
2009 E90 Le Mans Blue M3 6MT De-Chromed, AiB V3, Rogue SSK, Brembo BBK, Eibach Pro Kit, Eisenmann Race Black, ESS Tune, MS Filter. 1998.5 Titanium Silver E36 M3 Coupe NASA GTS2 Race Car.