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In the CRX I used to own going back to stock exhaust improved mileage by almost 5mpg and it had a life time warranty from Honda for as long as I owned it, it was amazing and light weight.
On the Civic VX over sized exhaust will burn out o2 sensors very quickly and reduce mileage.
Needing to have the CRX's engine up to 3,000RPM is supper rare, I hardly ever saw my engine speed get much over 2,500RPM
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