So, I currently have a SES light, and the code is saying my cat (well one of them) is not functioning properly.

I was thinking for cost and performance reasons, to just replace both cats with high flow cats. Should this fix the SES light?

If it fixes the SES light I'm thinking that's the way to go. I was also looking at the Random Technology High-Flow y-pipe for stock manifolds as well, has anyone tried that?

Looking around people are saying the Catco brand is best value overall, does anyone have a link to where I can check their stuff out?

Thanks all

 

I know some people here have high flow cats...did they cause any problems with the SES light or any codes?

 

I have no cat and i dont get a SES light .

 

I am under the impression that my problem is related to being an OBD-II car, but I could be wrong. I think that's the main difference, though.

 

Hrmm...fallen off the front already?

 

You are correct. That's why the OBDII has rear oxygen sensors.
Your options are to either get oxygen simulators or have the rear o2s programmed out. I can help you with the 2nd if you decide to do it this way.

 

i had the MAC high flow cats and the passenger side kept throwing the code that is wasnt working properly. so after a few weeks of that i ordered the off road y-pipe and a set of O2 simms. now i occasionaly get the ses light for a bad egr even though i have a new egr...lack of back pressure i guess.

 

As of right now I just have stock cats and one is possibly damaged from the misfiring, and I'm just looking for the most effective way to fix the problem.

I gather from your post that if I went with high-flows I'd probably have to get O2 simms anyways?

By programmed out, I'm assuming you mean reprogramming the PCM?

E-mail me with more info on that: aeromunch@pipeline.com

My main concern is that I do have to pass smog, but if I can gain some performance on the way, then great.