Welcome!
I wouldn't go putting motorcycle tires on your car. The load ratings for those tires are not designed for a car, and a tire that was designed to corner sideways wasn't designed for a cars suspension. The potential for less friction and lighter weight is not worth the the safety risks. Also, motorcycle tires wear quickly. It's a lose-lose.
But for the aero mods you seem to be on the right track. I would also suggest deleting your power steering and alternator as a future goal. As mentioned, California98Civic has provided lots of valuable information about our civics.
What kind of driving do you do mostly?
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