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I am new to this forum but I was just wondering if anyone had the same problem I am having and how did you fix it. I have an 01 a4 b5 1.8t with cat back borla with a test pipe...stage 1 apr software...k&n intake...and forge DV...I installed everything but the test pipe first and everything was working great...then installed a 3" test pipe and after a day I have a serious loss in power and I am throwing a code that says bank 1 running lean. It only has 50k on it so I am assuming the turbo isnt bad...please help! Where is the best place to start looking for the problem?