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I'm new to honda, my last car was a 62' nova. Anyway i bought a 08 civic, and instead of looking at hp gains, i would like to add mods for better gas mileage. Also if i register it at my parents house i will only have to smog it once until i sale it. anyone have any experiance removing the cat or any other smog crap and not having any o2 sensor problems?

 
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go have a look at gassavers.org.