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i always surprised that you guys didnt to mention about the transmission issue.
my e55 is all new bought from dealer, i spend alot time on the maintence, but after the weistec kits on, my transmission just immediately have problem to the new power..
I don't have any issues with the transmission but then again, I'm not running high boost as I take things slowly with this car (550 RWHP at the moment).
I went with Speedriven valve body upgrade and larger trans pan though, which might help somewhat as well.