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It is also known as the brake snip switch @Yusri Sharifuddin, it basically cuts the signal from the brake pedal to the ECU allowing you to build more boost while on launch control, and will also allow for wheel spin as the traction control is off.
I highly recommend the SXTH Element Engineering one. Excellent quality, plug and play, and looks awesome. They also have a dual set up too. I've been using mine for more than a year and it catches a lot of nasty stuff.
When you change the mode through your phone, does it open/ close the valves?
If it does then it could be that the remote needs to be paired/programmed again with the box.
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