88yotaboy

How important is it to have a good cat on the truck? Right now im running a hollow cat with a flowmaster muffler and 2" pipe from the cat back. Is it important for me to replace the cat? In my area smogging it isnt and issue unless i sell. The guy at the muffler shop said i dont have to worry about since i dont drive over 65(no freeway round here).

Thanks for any advice,
Andy

jimbo74

it will hurt your vehicle performance.. no matter what anyone says, it was designed to reduce greehouse gases and NOX and HC and other stuff... it is harmful to the environment, if you have EFI, it will screw up the codes as most run with an O2 sensor and it will goof that all up too.... physically it isnt going to hurt the truck, but running dirty is jsut not a good thing....

88yotaboy

What is the best type of cat to get?

jimbo74

a hi flow one... cats are pretty much universal, they are either stock flow or hi flow.... all they do is reduce harmful gas output.....

4RUNR

All the engine management relies on the 1st O2 sensor, the 2nd after the cat converter doesn't really do anything.

jimbo74

if the one after doesnt do anything? then why is it there? it uses if for something otherwise car amnufacturers wouldnt put one on there...

88yotaboy

Thanks for the info guys, any type of cat youd reccomend?

jimbo74

i have a catco, and they are hiflow

it depends.. there isnt really a difference between brand x and brand y... they all pretty much do the same thing........ except some are stock flow and some are hi flow

4RUNR

It works as an on/off switch to tell the computer if something went horribly wrong with the cat. It does not function in any way similar to the 1st O2 which actually detects temperature variations.

carose725

i got a dynomax high flow cat from summit racing. i think it was around $40

88yotaboy

$40 sounds good. I think im gonna order one up.