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I bought a 99 prelude about a month ago, a couple weeks into it, it throws me a p0420 code which it has to do with the catalytic converter. Came to find out the previous owner did a cat delete and straight piped it with both sensors connected. My car has poor gas mileage and it has rough idle. I want to know if the cat delete is whats making it have poor gas mileage because i honestly dont want to spend money on gas every week. And if it is, is there ways i can go around this or trick the ecu to make it seem it has a cat?? A friend said i can advance the timing on the distributor but i dont know if thatll fix it. I want to do something right now before i can buy a new cat because i need to save up for one. Please help
 
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