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well most stuff will ether hurt mileage or void warranty here is some stuff tho CAI, Chipping it, exhaust, and higher quality fuel, but you have an auto civic don't worry u will be considered a ricer they only have a 1.6 motor its to small to make fast just enjoy the fuel economy

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No such thing as "chipping it" unless you own a VW.

Higher quality fuel won't see any gains, especially if your meaning jump up octane.

1.6 civics can be ricers, its not hard to rice a car.

SS454 and Prisoner, the only way a part can void your warranty is if THAT part is the cause of the warranty claim. Look up the Magnuson Moss Warranty act.

With that said, a CAI can gain you about 4-5whp. Full exhaust will give about 10. Unless you go all out, you won't gain a whole lot

ill just get something with a bit more oomph when the warranty runs out

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