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      08-29-2011, 11:56 AM   #1
Strongbark
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Drives: 2015 M4 on order
Join Date: Jan 2008
Location: Earth

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Who's going JB4?

There's only one guy I know of who's currently running a JB4 on his car and he's not a member here. Anybody else considering this for their 1M? I'd be interested to hear how the already tuned N54 engine responds to the piggyback.

Let's keep this on topic too. No need to turn this into a tune war.