Sorry for the bump, but where does one purchase the OE tune from?
Any comparison against stock?
Google "Evolve Tune E90 N52" and click the porsche boost link (it should be the first)
the 325i showed a 25 hp gain with the OE tune. Which is the same gain claimed by the AA tune. BTW, note this is not on a dynojet where numbers would be a bit higher.