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      01-31-2013, 12:44 AM   #9
rjm98119
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Drives: 2013 335i xDrive
Join Date: Nov 2012
Location: Seattle, Washington, USA

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If you want a piggy back (similar to JB4) there's also the Hartge, I believe.

Regarding the JB4... if you have questions, you can just email Terry or go straight to Burger's site (www.burgertuning.com) which has most/all the info you need. Terry is pretty responsive over email.