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Old 10-05-2015, 03:41 PM   #8
Samson2029
 
Drives: 328xi, ML400, ZL1 man. 2013
Join Date: Aug 2012
Location: Quebec
Posts: 153
for a manual zl1, you may get a flutter noise or buzz at 800-900 rpm.
install a 5 percent ati balancer while they do the job. will get you some HP. and a tune is not required if there is no CAI replacement.
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