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Currently, my car has 142k on the clock. It runs pretty good, but the mileage is my main concern. I don't know how the car was handled before I got a hold of it, but I'm still nervous to actually get on the gas and go past 65. What should I do, maintenance wise, to sort of be preventative...

I live where there is no emission testing, and I know someone who can pass my car regardless of the exhaust, but is there a way to run a straight pipe in place of the cats? If so, how do I trick the car into thinking the cats are still there and the O2 sensor not freaking out and dumping gas...