It will throw a CEL. The high flow CAT makes the ECM think the CAT isn't working properly, because it was calibrated for the stock CAT. I put this on to take care of the issue.

 

im running a badmab header and a 3" to 2.5" exit catted ZZP DP with a magnaflow catback system, no CEL, stock factory tune still, runs a lil rich

 

What does that do?

 

Nothing.... your car will run fine.

You will just pop a 0420 code.

This can be tuned out, or avoided with an O2 defouler plug/bung.

The stock LSJ cat is high flow, but it is 100% OBDII compliant.

The magnaflow cats that zzp uses on their downpipes are also OBDII compliant, but are at the very edge of being so. Some people throw a code some don't.

If you do, it's no big deal.

 

Well, this may sound weird.. but do you think I can just piece together a down pipe? or is the stock cat not 2.5inches at the open and the end?

 

The stock downpipe is 2.75".

The inlet & outlet of the stock cat is close to 3".

The angled O2 bung can be found on e-bay, or some of our venders websites.

They go for $25. Just pick one up, or tune out the rear O2.

 

Man up and just get the downpipe lol. /close thread

 

I was Trfiecta tuned with 42's and 2.9 pulley, added Badmab header, broke the down pipe added ZZP catted pipe and never got a CEL. Maybe because Trifecta already tunes it out?

I do need to datalog though for my upgrade exhaust (header, pipe and muffler) plus I never did it after the original tune.

 

Vince prob tuned it out.

 

I hate check engine lights. And no, electric tape over the cluster will not fix it

How would an angled bung keep the light away? I'd like to understand why that works like that...

Doesn't the stock DP pinch down at some point and that's why it causes a restriction?

 

The angled O2 bung removes the rear O2 sensor from the direct flow of the exhaust gases.

The stock downpipe has a pinch at the O2 sensor, and necks down to 2.35" before the rear 2-bolt flange. Those can become a restriction once you start to flow more air.

 

Yeah I figured that but it must be part of the original tune becuase I didn't have my ZZP pipe yet but it would make sense to do it tune it out.

 

Hmmm... Well, Maybe i'll try that angled thing. But I am stock so a down pipe wouldn't be beneficial unless I get a tune?

Also, I'm reading if I push a dealer enough, I can get my DP replaced for free under warranty? Because it's all one piece?.. The reason is I have a cracked flex. I am looking at buying a new DP or just getting a new flex pipe welded in.. I'd rather get a stage tune of some sort, THEN doing some exhaust work because to be honest, I don't need much faster.. but who knows once the stage kit goes on

And the reason why I am so hesitant is because I am extremely picky on how a 4 cylinder sounds, I really don't want that damn pissed off bee sound all the kids love these days.. Also, I do have an extended warranty that already paid itself off because of parts that went bad right away. So I don't know if a new DP would ruin it.

Anybody got info on how I can fight to get it fixed under warranty? then I can just buy the stage kit because I know that's the biggest bang for buck.

 

The down pipe alone did nothing to make my car sound raspy. If I really revved it i could tell that along with the header there was a bit more sound to it but not the nasty sound you are talking about. i got into trouble with sound when i replaced my stock muffer. I am still contemplating doing something there.


I would say get the ZZP downpipe.

mine cracked too and I read a lot about what to do first. everything was goign to be a mickey mouse reqpir or the stock pipe was going to cost just as much. the ZZp pipe is stainless so it should last longer too.

I had ZERO hesitation buying the ZZP pipe after reading and getting input from all concerned. A mechanic even told me that it was pointless repairing the pipe which some places quoted me for. When i told him the price of the ZZp pipe he said GET IT.....

 

K that sounds good

 

Like staged said it moves the rear 02 sensor out of the direct line of exhaust gases. It is a way of bringing the values the 02 sensor sends to the ECM back into the "acceptable" range. That sensor has no bearing on how the engine runs, or performance, so even if it did cause a CEL, you don't have anything to worry about. Just buy the downpipe, and get the angled bung to be safe. If you don't pop a CEL without it, I'm sure you could resell on ebay. If you do, then you'll already have it.

BTW, don't waste your time with the defoulers you can buy at autozone, etc. They don't move the 02 out far enough, and you have to drill them out to get them to work.

 

I assume you just screw it in where the o2 sensor was, then put the o2 sensor in that right>?

 

Yep.

That's it.

 

Yay! I'll give that a shot I should be getting a small gain in power right? Im not expecting much of anything. But thanks for the info I will be ordering both of those parts

 

Oh, and this is the correct size and everything right?

o2 02 oxygen sensor header 18mm thread bung pipe spacer M18 x 1.5 90 degrees HHO | eBay

 

Yep, that one worked perfectly for me. Be sure to leave the nut on it, or it won't clear the cat. It lines up almost perfectly parallel to the cat.

 

With a downpipe and no other exhaust mods you can expect somewhere around 5hp.

Open up the exhaust, and you will notice more.

 

Or take it somewhere that buys used cats for the metals inside and they usually get close to that...

As far as the CEL... ive heard anti-foulers work sometimes, they basically move the sensor off the pipe a bit and expose it to a bit less directly to the exhaust gas, although i dont fully understand that as the gas should flow throughout the entire system no matter what...

you could also try a catless pipe and have an exhaust shop weld in your own cat that is a bit more efficent (less "high flow"). The biggest restriction is the dent in the downpipe anyway so you shouldnt lose much if any power Cats nowadays arent much of a restriction for mild modded cars anyway... It shouldnt be much more expensive either...

 

I am not even going to lie. I have the P1133 CEL for my front O2 sensor. Any ideas on that one? Possibly contaminated O2 sensor? Its still the factory one that came with the car.

 

Turn of events!!

Called up my dealership, they ordered me a new stock downpipe and are replacing it for free. They are covering it under that warranty.

So saving the money for a stage 2 kit!!