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Has anyone put a JB4 on a 330i yet? If so, how much can you feel the gains and is it worth it? How tough is the installation process? I am mostly looking to install a JB4 over BM3 bc my car is a lease and I've already heard a few nightmares w BM3 on G20s. Also, how safe would it be to install a JB4? Would I need to remove it before every dealer visit or would I be fine? Anything helps! (Also debating whether I should just get racechip)
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