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Soo, what's the update. What cats did you go with, stock or afermarket? I have everything you got and probably going the same route. I have a buddy that abuses his GS430 l-tune jeust as hard, he is getting the same symptoms now as we are. I have come to the conclusion that these cars were not meant to be driven like this. I will fix this whip use it as a daily, and then its time for an M5 upgrade.
Well i drive this thing hard and it likes it. My cousins who all bought bmw's don't believe how i can push my car so hard with out it "breaking" I just smirk and say its a lexus. I replaced the Cats with some "performance" after market cats that greatly changed how the car ran it felt a lot better. I am still waiting on $$$ to change the Maf/o2 sensors and the K&n cone filter to a dry non oil one then the car should run perfect.
Do you have the part number for the cats? Or the size that you used? Only difference I have in my car from everyone else with this problem, is that I never got a check engine. Don't have any codes, and I checked the computer already, everything is fine there. This car is reliable, I agree, but no M5 in terms of performance. I will keep it for daily driving. Thanks