Why would the Civic need "upgrades"? They generally erode the two things I look for in a car:
1) reliability
2) economy of operation
The only thing I imagine that would justify the cost is if there is a sexual selection process at work here. I'm sufficiently out of touch that I could see that being the reason and my being ignorant of it.
Claimer: I have a 2013 Honda and it is dead stone stock.