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I talked to my Dealer today Wilkie Lexus in Bryn Mawr Pa. They said regarding the Trans. ECU that they would have the patch for it as of fri. They explained to me that the problem was that they used the ECU mapping from the GS400 on the trans and that they had adjusted it down in order to make the GS a more smooth car during shifts. When they transferred this over to the IS it became laggy and hesistant. So they have a Patch for it and will only do the upgrade upon request and avail. Also not all dealerships have this patch yet. I am not sure how tru this is but this is what they tell me and my IS goes in fri to get it all fixed...
I will let you all know how it werks out ...
 
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