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Any Chance, there is a good bolt to use as a ground location in the trunk? I'm a little reluctant to use the bolt under the headliner because I had trouble getting a good ground in my e90. My old detector would routinely cut out for the first 3 min after starting up my car on cold mornings, and I'm pretty sure it was related to a bad ground connection. Did you sand the material around the bolt at all in your install?
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