I would just add a sub in the trunk. Ive disconnected the front door subs in mine now. Adding them in would be a bit of a task. Or you could fiberglass something up too.
The doors dont shake/rattle too much on the shaker system. But they do vibrate quite a bit.
A 12" in the trunk will be louder than two 8" shaker door subs. And will sound nicer with the right equipment. I bet the prefab sub boxes that fit OEM style would sound pretty good too. Plus save trunk space
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2011 Kona Blue MT82 V6 Mustang Pony Package 3:31 Gear Ratio, Interior Upgrade Pkg, Security & Shaker500/Sync
Mods (in order of installed): AM Bama SCT SF3 Tuner w/ 87 Hybrid Tune, Airaid CAI, Hurst Billet Plus 2 Short Throw Shifter, Lethal O/R H Pipe w/ Stock Exhaust, Blacked-Out Tints on Rear Windows, Full Ceramic Tint on Front Windows, Metra Touchscreen Dash Adaptor, Single DIN Head Unit, 6.5'' Component Speakers Fronts, Stock Rear Speakers, 10'' Sealed Subwoofer, 4ch. and 1ch Amplifier. LED licence plate lights, LED interior dome lights, FRPP/Dynamic shocks and struts, SR Performance lowering springs, GT500 Strut Mounts, BMR Adjustable Panhard Bar, BMR LCA's, BMR Relocation Brackets. Rear Seat Delete.