I'm about to order my cats. I know which one is bad but since i'm getting it done do i need to replace all of them if so how many do i need. Do you replace the pre cats also. Please let me know how many i need. Really plan on doing it this weekend.
I have a 2001 E320 and the cats on mine have started ratteling and was curious about gutting them. How does your car run now and did it effect the fuel millage or preformance?
you do, but my state don't have smog test or all those emission laws. And i dont plan on traveling out of town in the car or taking trips, I use my SUV for that.
when you get a chance to drive the car a bit and do some testing please post the results. thanks
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