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For exhaust valve with BM3, If you want to manually open and close it yes you will need to be plugged in, either obd enet to computer or with wifi agent. Otherwise you can program valves to be open in sport/sport+ with bm3. All of this applies to stock valve wiring, so If Akra plugs in there then should operate the same.
Ask far as Downpipes, vrsf should work fine without welding anything!
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