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what year of CRX is it?
Even tho the HF wheels were steel, they were a light weight steel wheel, civic VX, HX, Honda Insight, or early 4 bolt Civic hybrid wheels will all bolt on, not sure on the weight of the SI wheels but the above mentioned wheels are all around 11-12 pounds each.
The stock HF front bumper had a lower lip, some years of the HF had aluminum rear brake drums, is the SI drum or disk rear brakes? Honda Insight aluminum drums bolt on and can be found used.
I realize people like to "make their engine breath better" but an exhaust sized for a 4 liter engine does not help, the HF had a small exhaust, not because it was cheaper but because it helped with mileage and low end torque, HF transmissions shouldn't be to hard to find, I use car-part.com all the time to find used parts, alot of them are close by, others are shipped via low cost shipping companies that are used to dealing with bulky parts being sent to body shops and mechanics.
But as it is, good low rolling resistance tires, synthetic motor oil in your transmision and a tune up should help you be on your way to 40mpg.
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