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Sorry even I don't understand what you mean. Just because it taps into the fuel rail sensor doesn't make it a bad plug in chip. The best thing about it is that it is not a permanent install. Easy to remove when going to BMW etc. I have never been a fan a permanent programming. I think this is a great product and it is well worth the money. On my European spec 335d I am making close to 320 rear wheel hp. Not bad for a wagon and over 510 ft. lbs of torque.
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