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			Because the trunk is already so small, I always fill the tire well with tools and such and keep the spare where it is. 
 
I couldn't tell you if the support is structural or not, but instead of just cutting it out, why not remove it in such a way that it can be put back in future if desired/needed. 
 
As for sub enclosures, (not being a sound guy) can you not put it behind the driver and/or passenger seat?  Or even better, how about a 3rd gen bose sub with the soundwave tubing laid sideways and exiting through holes cut into the front of the spare cover? 
 
Just an idea.
		 
		
		
		
		
		
		
			
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