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Hi, I have a 710N dump/diverter valve, a n75 and a grey plastic n249 which are as far as i can tell the three main components that would stop the car from maintaining boost. Tomorrow i am getting my mechanic to replace the DV first of all, then if it still is surging the n75, and then trace...

Hi Guys, I recently bought a BEX 190hp A4 quattro as above, and after having it revo'd have got surging and generally bad boost after 200 miles. The technician at Revo has been really helpful and has pointed the finger at my n249 valve. The issue is i cannot find it and my dealer says it...