If you want to remove the tire and keep the sub then you can cut a piece of pvc pipe the approximate height of the tire and place sub ontop and screw it down into the floorpan like normal. It's kind of ghetto but should work. I agree replacing the tire with a sub would sound soooo much better.
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09 6MT MB: Int/Ext LEDs, Stillen G3 + FI test pipes + FI cat back + Stillen sways + Clutch Helper Spring
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