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Message: <blockquote data-quote="DFW40" data-source="post: 552235" data-attributes="member: 556468">I have a 2001 325i and I know what you are saying about bass getting trapped or lost. You can take out the rear speakers and any of the factory (6x9 subs). This will give you some more sound into the car. I would be careful with where you point the ports because of the noise that can be associated with doing this. The ports would need a few inches of clearance so they can operate properly also without extra noise. Make sure you cut or punch the holes all the way through underneath the rear speakers, they have a heavy carpet pad type material that will eat up bass and not let it pass through.After you have added some holes into your rear deck then see which way the box sounds best. With the seats up and the rear deck with holes I'd try the box with sub and ports facing the back of the trunk.</blockquote>

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