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05-31-2012, 09:57 AM
Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Originally Posted by
JB3 takes all of 10-15 minutes to install, hardest part is removing the air box..
JB4 probably doesn't take that much more time..
You don't need to remove the air box to install the Stage1
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