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Will a set of MB Quart DSD 6.5 components fit in the doors of my 330ci without modification. Some say they are 5.25's and others say they are 6.5's. What size speakers are in my doors?
 

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I have 6.5 Quart in my cabrio. No major modification.
 

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I really like mine but they are fairly bright sounding. I have them in the stock locations. I run them through the stock head unit then to an audio control eqs then a fosgate 800a4. I have Quarts Q's btw.
 

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just take out the ring that holds the oem speakers in place, then put the 6.5 woofer in place. I used 3 brackets to secure them thight.
 
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