PHD FB 5.1 kit
PHD Audiophile Systems Dealer
I can't decide for you if you want to modify the door to fit a larger mid, but you will get better midbass performance from the larger driver. You need to isolate the rear wave from the speaker from the front wave in order to get the best midbass response, which is not related to the choice of speaker.
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Perfect Fit Speaker Kits
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My system: Pioneer AVH-4000NEX, JBL MS-8, Clarion XC6610 x 2, CDT 6.7"/4"/1.1" in the front doors, 4"/1.1" center channel, Pioneer TS-W3003D4 12" ported, Clarion SRG-1622R rear fill