Nice car, alright. Nice hunting too. Those 14" HX wheels and tires are each probably about 4-5 lbs heavier, for a total 16-20 across all four. Double that to yield a rough rotational mass of max 80lbs extra, which is significant on a 2000lb car, but not amazingly large. But the HX wheels being bigger also changes your gearing. The VX already had really tall gearing, and slightly larger wheels/tires makes it even taller. At cruise on the freeway you'll have lower RPMs and that's pretty cool. Unless the whole exhaust system has been tuned, the common wisdom around here as I have learned it is that the muffler is basically meaningless, so keep it and save cash there. The air intake filter thing pulls air from an area of the engine bay not so far different from the stock location. Warmer air is available closer to the exhaust manifold and catalytic converter. Good luck!
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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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