My friend had some subs in his 350z pushing alot of power and problems he had were: windshield wiper flew off, rearview mirror broke off, licenses plate scratched paint, had to retighten lug nuts every so often. this is an extreme case but this goes to show you what can happen if you throw as much as you can in a car. he stripped his interior down to fit the subs in.
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2012 Mustang GT Kona Blue