Check it out, https://www.youtube.com/watch?v=mLIJ...&feature=share
That is the change you gain by removing the cat and putting straight pipes, turning the check engine is a trick one though i have done it cost was 250$ (im based in Ukraine).
Cheers!
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BMW X5 4.4l Alpina White 2001
Jeep GrandCheroke v8 SRT 2011
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