Installation Point: E90 ACS Front Lip Spoiler

Basically, we simply follow the steps of the hard copy ACS installation guide. 

1.after we take off the lower grill on two sides, we still need to take off the bar on the middle grill.
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2.we need to trim the bar on both side a little bit to make it shorter so that we can put on the front lip successfully.

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3.In the ACS installation guide, they suggest us to change the lower grill to 4-cylinder one(320i).  We don't need to do that.  Just trim the bar a little bit.
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