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Hard to really diagnosis without more info or without driving the car. There is a rather dramatic difference in 1-2 gears then the higher gears but my BOV is pretty consistent. I use a synapse BOV with ER pipe. I would first get a boost gauge and check that out. You will see how much boost you are getting (stock 6-7lbs) and that could help determine if you are having any leaks etc. also, what software update do you have on your car? I have read a lot about different software updates from BMW doing some strange things.
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