Hello everyone, I pick up a 2011 550i monday, I want to get bms stage 1 or else a jb4. I have been reading about the cars for a few weeks now but I can't find any info if it's better to change spark plugs, coils and map sensor before you install the tune, or if it doesnt matter. It has 60k miles on it and it's all stock so far.
Last edited by craigrezac; 06-16-2018 at 03:11 PM.
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