When and how do you know when to replace your catalytic converter. I have read on a few different sites that after years of use it should be replaced (I don't buy it) They claim more power and better fuel economy.

I know if it is plugged it will not allow it to start due to pressure. Truck is a 1986 Bronco XLT so it makes it 25 years old, should it be replaced or not? Only asking because muffler and tail pipes need doing.

 

If you are doing the muffler and tail pipe you might as well. I'd recommend getting a new Y-pipe or at least replace the 2 cats with a single hi flow from Magnaflow.

 

try summitracing catco cats
Search Results for catco - SummitRacing.com

 

i replaced my cat converters with a hiflow cat from Magnaflow, runs about $60 and is 3" in/out. i am very pleased.

we dont know what motor your have, regardless get the Y pipe rebuilt from scratch. all mandrel bent and what not. make sure the o2 sensor is in the same location as before.

 

Does anyone that used a Magna flow high flow cat have a part number? There are so many to chose from.

Also I am pretty sure that I only have a single cat just before the muffler, did newer models go to a two cat set up. Mine is a 1986 with 5.oL

 

I just bought whatever the parts store had in that was 3" in and out. I made sure it was a 3 way that did not require oxidation.