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I've been trying since I got the car. The problem is with the MAFs. The pipe size and shape has to remain exactly the same as stock to keep them reading right. And the pipe is a weird shape. I tried Burger, they say theres not a big enough market to warrant the R&D. I think thats BS because the 550, 650, 750, B7, X5 50i and X6 50i all use the same airboxes. I'm working on K&N now, but they don't think its promising.
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