Go to the "other" forum... They have the TEKA box in the list for you over there the Yosh is for use here in the USA. (That's just how they split it up)
And the dealer is correct they all do do that (until you fix it with a yosh or Teka box!) The 2006 is supposed to have a better program in the ECU
I prefer the Teka Box personally but the Yosh did fix mine. I believe the old ECU could also benefit from some timing, as well as just fuel changes. Neither of the 2 boxes do that.