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x3 tune

  1. 2005-2010 Mustang GT Tech
    hey guys i had a question about taking my stock x pipe and cutting of the stock cats and welding on some highflow cats that i bought for my 03 saleen but didnt use. any tips or suggestions would help me big time:) also do i need to adjust my x3 tune for the new high flow cats? :scratchchin
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