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Thanks mieluise for sharing the information on 120i jb4. I have a 120i as well and like to try JB4 or bms on it.
I don't think it's going to make any damage to your car because I don't see JB4 provides a list which what kind/which brand of intake or downpipe should be use for map2. or even the standard of air flow.
Why they suggested I think it's may because of various gas condition around the world and better intake and downpipe will definitely help the ecu to increase the psi easier
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