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      09-04-2018, 06:59 AM   #7
billybarr
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Drives: 2015 M3 yas marina
Join Date: Apr 2016
Location: NJ

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Hey, I'm just a regular guy, 50 years old, just got an M550. I use pump gas, stock exhaust. If I am just using 93 octane, no modifications, no anything, and they're only offering map one right now for the JB4,is there really a difference between jb4 and jb1???
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