I'm gonna try and translate:
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I bought an Invidia Q300 2 weeks ago. Upon installation of the test pipes, my"check engine light" came on. I also notice a lot of vibration in the shift knob. When I try to rev in neutral, it only goes up to 5,000 rpm's. It's fine when its in gear (D).
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I would suggest getting an OBD reader to see what codes you have. The likely cause is a faulty O2 sensor. There shouldn't be any vibration with the shift knob, especially since this is an Automatic, correct? The rev limiter in neutral is normal I believe, but I could be wrong.