Welcome! We have nearly the same car. If you check out my garage entry you'll see (too much) information applicable to your car. Here are some other ideas, first thoughts, looking at your list...
You should lose the type r spoiler. Unless they're flat against the trunklid, they make drag because they are there to reduce lift. If any of that other stuff is "racer" think about whether you might get rid of it, especially aftermarket quarterpanels that look "aero" but are probably counterproductive. Got pics? What are wheel studs? Give us some more details.
Oh, and switch to a stock exhaust size at the first opportunity.
Cheers,
James
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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