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JB4 upgrade
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02-22-2011, 04:37 AM
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solidgold
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Drives: Z4 E89
Join Date: Feb 2010
Location: Singapore
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JB4 upgrade
Understand that JB4 for E89 is out. Comes with full mapping integration with dashboard display. Not sure is it a worthwhile upgrade? Anyone tried and see improvement in torque or bhp?
Appreciate
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