3" Cat requirements?

[Dominic]

If I replace my cat and I pipe with a 3" Catco and 3" piping, will I need O2 sims or will my O2 sensors work fine on that cat? Should I opt for a 2.5" cat instead if I swap cats?

[RedbirdV6]

Sometimes it will be just fine, and sometimes you get the dreaded SES light. I have heard some people get a high flow cat and never have any problems

[Silver2000V6]

I've had my Catco 3" for a couple months now without O2 sims and haven't had any problems.

[ February 14, 2002: Message edited by: Silver2000V6 ]</p>

[TheBeast]

<blockquote>quote:</font><hr>Originally posted by Silver2000V6:
I've had my Catco 3" for a couple months now without O2 sims and haven't had any problems.

[ February 14, 2002: Message edited by: Silver2000V6 ]<hr></blockquote>

ditto

[Dominic]

Thats good to hear, thanks guys!

[jamie]

same with me. going on to about 3 months with the hi-flow, and i don't have an ses light. still using the same 02 that came with the car.

[Blac Drop Top]

When i ran a 3" magnaflow cat, never had any problems. Then 2 mths after i switched to 2.5" catco the ses light has been comming off & on ever since. Obviously the smaller size is triggering the ses.

[mike malloy]

any improvements with the 3inch cat