[chrisb46]

Hey i have a 2008 titan and I live in the Cayman Islands where cat's aren't required and my service engine soon light came on, i got it scanned at the mechanic and they told me my cats were starting to get clogged (wouldn't be a problem for like a year) but my dad took his out on his f150 and replaced them with regular pipe so i'm wondering if it will affect performance or if the ecu will have problems with it. Help is much appreciated thanks

 

[bestatchess]

Failing cats can cause grit to be back sucked into the engine, destroying same. Not something to be ignored for a year.

 

[chrisb46]

yeah i know, i'm gonna remove them in a few days but what i need to know is if i take them out and just replace them with pipe will it affect the truck besides more noise, like will the ecu run funny without them?

 

[halfoftwo]

If the cats in question are the front ones (4x4 has two) then yes it will affect your ecu. You will end up running lean which will hurt your engine in the long run. You can get uprev that will adjust your afr to equal out.

 

[chrisb46]

It's 2x4 and what exactly is an uprev?

 

[04BlackTitanLE]

Why would it lean out the afr? Afr readings are taken before the cat. Rear o2s are only for cat efficiency and their readings don't have any effect on the engine. Or so i've been told on various forums and such.

 

[T-Dog23]

It's 2x4 and what exactly is an uprev?

Uprev is a programmer.