Re: New exhaust system affect engine?
you may have a problem with the o2 sensor, this may cause the check engine light to come on, and when this happens it causes the mixture to richen and wreck your fuel mileage, if the light dont come on, you are fine. you should see improvement in power and mileage. If it does come on there is not enough restriction. You can cause these computer controlled engines to breathe too well. Good Luck
My truck is not rusty, that's caked on mud. Jason