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o2's stcuk lean

  1. 2005-2010 Mustang GT Tech
    I just recently put a set of full length headers and a offroad h pipe on my 2006 gt. Ever since I have installed the exhaust system it has been tuned and dynoed 6-7 times. The thing that is dtiving me nuits is that I am still getting a check engine light and its throwing a code for bank 1 sensor...