MF High Flow Cats - What can I do?

[hemiitis]

I have been running the MF HF Cats and MF Catback exhaust on my 2008 Super Bee since about April, 2008. I have to pass an ODBII check in Feb. 2010 and these cats currently throw codes that are prevented by disabling the rear O2 sensors. My question is, what can I do to eliminate the codes so I can turn on the rear O2 sensors and pass the ODBII readiness test?

The vendor that sold these has tried the various extenders tricks for the O2 sensors, but nothing has worked. I really don't want to go back to stock cats.

Please help!

[SHARKY 370]

Id like to know that too. 5 days and nobody has any ideas??

[hemiitis]

Bumpity bump??

[black08]

Give Josh a call @ HHP and ask him. He will prob have a answere for ya

[DarkKnight_SRT8]

You could get a diablo predator and change the settings. You will no longer throw codes for the MF HF cats

[hemiitis]

Give Josh a call @ HHP and ask him. He will prob have a answere for ya
OK, I'll try that, thanks!
You could get a diablo predator and change the settings. You will no longer throw codes for the MF HF cats
I have a Predator that can still disable the rear O2 sensors (that feature is gone for good with the latest release). However, you cannot pass an ODBII inspection with the rears disabled which is the problem I'm trying to solve. Thanks for the thought!

It would sure be nice for MagnaFlow to respond here... :thumbsup:

[BOSChargerRT]

OK, I'll try that, thanks!

I have a Predator that can still disable the rear O2 sensors (that feature is gone for good with the latest release). However, you cannot pass an ODBII inspection with the rears disabled which is the problem I'm trying to solve. Thanks for the thought!

It would sure be nice for MagnaFlow to respond here... :thumbsup:

to pass inspection with high flows, you just need to install spark plug foulers. use two of them and drill the middle one out, to allow you to fit the sensor. it got rid of my code, even without disabling it thru predator and i passed inspection.
i got the fowlers at autozone, spark plug non-foulers, #42002. you'll also need a drill bit, to open the top fouler that attaches to the sensor.

[bluecar1968]

to pass inspection with high flows, you just need to install spark plug foulers. use two of them and drill the middle one out, to allow you to fit the sensor. it got rid of my code, even without disabling it thru predator and i passed inspection.
i got the fowlers at autozone, spark plug non-foulers, #42002. you'll also need a drill bit, to open the top fouler that attaches to the sensor.

X2 spark plug anti foulers work even with no cats i'm running catless mids with no codes in over 2 years

[hemiitis]

to pass inspection with high flows, you just need to install spark plug foulers. use two of them and drill the middle one out, to allow you to fit the sensor. it got rid of my code, even without disabling it thru predator and i passed inspection.
i got the fowlers at autozone, spark plug non-foulers, #42002. you'll also need a drill bit, to open the top fouler that attaches to the sensor.

X2 spark plug anti foulers work even with no cats i'm running catless mids with no codes in over 2 years
Thanks for the idea guys, but I mentioned in my first post that the extender tricks were done by the vendor and did not solve the issue. I wish that had worked...

[hemiitis]

So, I've been out of the country on a cruise ship for a week and I return to see that Magnaflow still has not responded to this thread. They sure do make good exhausts, but I was really hoping for some help here. I guess I'll quit holding my breath...

[alberni_charger_R/T]

this says to pack steel wool in between the anti foulers...
im sure this is prob what you made refrence to in first post, if so sorry n good luck
if not hope this works
http://www.chargerforums.com/forums/showpost.php?p=1402949
beautiful car by the way..:driving:.love the B5s

[hemiitis]

Thanks for the reply! I see that MF has responded in another thread, so I guess I'm being ignored...

[MagnaFlowPlus]

I have been running the MF HF Cats and MF Catback exhaust on my 2008 Super Bee since about April, 2008. I have to pass an ODBII check in Feb. 2010 and these cats currently throw codes that are prevented by disabling the rear O2 sensors. My question is, what can I do to eliminate the codes so I can turn on the rear O2 sensors and pass the ODBII readiness test?

The vendor that sold these has tried the various extenders tricks for the O2 sensors, but nothing has worked. I really don't want to go back to stock cats.

Please help!

Hi hemiitis,

What are you running in terms of converters? Are you using part # 16420 (http://www.magnaflowplus.com/showitem.aspx?&id=101379&name=2006-09%20Mopar%20SRT8%206.1L%20HEMI%20High%20Flow%20Co nverters)? They were designed for Off-Road use only if so. What else have you done to your 08' aside from the converters and cat-back? What code are you getting?

Please give me a few more details on your ride and I'll help the best I can. Please feel free to call, email or PM me anytime with questions. Have a happy holiday!

Kind regards,

[hemiitis]

Hi hemiitis,

What are you running in terms of converters? Are you using part # 16420 (http://www.magnaflowplus.com/showitem.aspx?&id=101379&name=2006-09%20Mopar%20SRT8%206.1L%20HEMI%20High%20Flow%20Co nverters)? They were designed for Off-Road use only if so. What else have you done to your 08' aside from the converters and cat-back? What code are you getting?

Please give me a few more details on your ride and I'll help the best I can. Please feel free to call, email or PM me anytime with questions. Have a happy holiday!

Kind regards,
Yes, I do have 16420. I told the vendor (Frank Racing in Houston) that I needed to be street legal, but found after several months later that these were marked "off-road". Other mods are in my sig, Predator, 180 t-stat, AirRaid Intake, MF Catback Exhaust...

Thanks for the response!!!

[Deuuuce]

Question: Any one try it with the stock tune, warmed up, before the code is actually "thrown" and displayed?

[036charger]

I'm installing MF cats and cat-back this winter. I'm going to throw a code? I don't need to pass any emissions. Is the code just a light on,can I turn it off?

[MagnaFlowPlus]

Yes, I do have 16420. I told the vendor (Frank Racing in Houston) that I needed to be street legal, but found after several months later that these were marked "off-road". Other mods are in my sig, Predator, 180 t-stat, AirRaid Intake, MF Catback Exhaust...

Thanks for the response!!!

No problem! My suggestion would be to find a good tuner and have them make the necessary adjustments so the sensors read correctly. What part of the country are you in? I'd also be curious to know what the exact code is if you happen to know.

Please feel free to call, email or PM me anytime with questions. Please keep me posted as you get more information. Have a Happy Holiday! :beerchug:

Kind regards,

[MagnaFlowPlus]

Question: Any one try it with the stock tune, warmed up, before the code is actually "thrown" and displayed?

I would be curious to know the exact code? If someone knows which code is being listed I'd like to know.

I'm installing MF cats and cat-back this winter. I'm going to throw a code? I don't need to pass any emissions. Is the code just a light on,can I turn it off?

You can have it turned off or tuned out by a tuner if you have any issues. I've only heard of a few cases so keep me posted. If you're looking for a good deal on the Magnaflow products let me know! We will meet or beat any price on Magnaflow products.

Please feel free to call, email or PM me anytime with questions! We appreciate everyone's in interest in our products and have a Happy Holiday! :beerchug:

Kind regards,

[charginscott]

If you have a tuner you can disable the rear 02 sensors so you will not get a CEL.

My bet is DTC P0420 Catalyst System Low Efficiency
and/or DTC P0430 Catalyst System Low Efficiency

MF+, hemiitis is in Texas, Houston area. We have to have them enabled to pass emisions down here

[hemiitis]

I would be curious to know the exact code? If someone knows which code is being listed I'd like to know.

As charginscott guessed, I'm getting the following codes:

DTC P0420 Catalyst System Low Efficiency
DTC P0430 Catalyst System Low Efficiency
You can have it turned off or tuned out by a tuner if you have any issues. I've only heard of a few cases so keep me posted.
Will having a tuner do this allow me to pass the ODBII test? If not, then it won't help. If so, can you pm the name of a tuner in the Houston area that can do this?
If you have a tuner you can disable the rear 02 sensors so you will not get a CEL.
Yes, I've been running this way since I got them installed and after each attempt by FRI to eliminate these codes, but I won't pass the ODBII inspection comming up in February with the rear O2's disabled...

Today I reenabled the rear O2's and was data logging when these codes were thrown. I don't know if I captured the best PIDs, but here's a list of what I logged:

Time
EXH TEMP
CAT Modeled Temp
1/1 O2 Sensor Goal Volts
O2S 11 DEF GOAL VOLT
1/1 O2 Sensor Volts
2/1 O2 Sensor Volts
2/1 O2 Sensor Goal Volts
1/1 O2 Heater Temp
O2S 21 DEF GOAL VOLT
2/1 O2 Heater Temp
O2 HTR11 SENSE VOLT
O2 HTR11 REF VOLT
O2S 12 GOAL VOLT
O2S 12 ADAP
O2 HTR21 SENSE VOLT
O2 HTR21 REF VOLT
1/2 O2 Heater Temp
O2 HTR12 REF VOLT
O2 HTR12 SENSE VOLT
O2S 22 GOAL VOLT
O2S 22 ADAP
2/2 O2 Heater Temp
O2 HTR22 SENSE VOLT
O2 HTR SENSE VOLT
IN MAN EGR MASS
EGR EXH PRESS FILTD
EGR SONIC FLOW
EGR PRATIO
EGR Mass flow rate des
EGR Flow
EGR EXH TEMP
I can post the data log here if it would help anyone to see it.

[black08]

Mine only trip on long trips where the RPM`s run at about 2100 for extended periods of time. I`m gonna get a tune and fix that though

[Here'sJohnny]

that's why they are off-road use only... they really should be replaced but it seems that some have had luck using adapters and extenders to cheat the computer back into complacency... I think the problem may be that it has to sense something but too much and it will fail and too little and it thinks you are cheating...

Yes, turning off the sensors won't work because the way they are testing the system is to hook it up to computer that reads parameters... It is automatic fail if computer says anything is bypassed or turned off....

That's like putting electrical tape over your CEL and calling it fixed...

Good luck especially since you specified you wanted it street legal and they sold them anywyas... Money is the bottom line I guess... There really wouldn't be much market for off-road parts though so I guess they gotta sell em somewhere....

[Daytona606]

still not sure why anyone would replace the stock cats unless it is a track car. and in that case remove them completly. stock cats are surprisingly high flow. sorry for the tangent - hope it works out for you.

[hemiitis]

Mine only trip on long trips where the RPM`s run at about 2100 for extended periods of time. I`m gonna get a tune and fix that though
Can someone explain exactly how a tune can address this issue? What exactly can be done in the tune that prevents the DTC from being thrown? Thanks!

Also, is it possible from the PIDs that I logged to determine if my O2 sensors seem to be good or bad? Can that be determined from a Predator datalog? I've attached the Predator datalog in case someone cares to look at it.

EDIT: Oops, it's too big to upload. I can send it to anyone who asks...

[MagnaFlowPlus]

Can someone explain exactly how a tune can address this issue? What exactly can be done in the tune that prevents the DTC from being thrown? Thanks!

Also, is it possible from the PIDs that I logged to determine if my O2 sensors seem to be good or bad? Can that be determined from a Predator datalog? I've attached the Predator datalog in case someone cares to look at it.

EDIT: Oops, it's too big to upload. I can send it to anyone who asks...

Hi hemiitis,

I haven't done it on a Mopar as of yet but you can change or calibrate the rear o2's to basically tell them it is in the operating range. I also know of some simulators we've used on some GM applications that basically told the system everything was reading correctly. Because the Magnaflow converters flow much better the rear o2 sensors are seeing readings outside of their operating range. I'd recommend Late Model Racecraft out of Houston HERE (http://www.latemodelracecraft.com/contact.html) in terms of tuning. They are good guys and they will get you pointed in the right direction.

The other option is to change out the highflow converters for the stock converters for the test, I know this is a pain but it is an option. I always tell customers these are Off-Road use only and make sure they understand before selling these types of products to customers. It is too bad they didn't let you know when you ordered the converters.

Please feel free to call, email or PM me anytime with questions. I apologize for the issues you're having but I'm sure we can get it figured out. I hope you had a great holiday and Happy New Year! :beerchug:

Kind regards,

[hemiitis]

still not sure why anyone would replace the stock cats unless it is a track car. and in that case remove them completly. stock cats are surprisingly high flow. sorry for the tangent - hope it works out for you.
I replaced them for the ~8 RWHP the MF HF Cats provide, but I thought they were after-market replacement cats at that time. Live and learn...

I've never understood making "off-road" cats, either. Why would anyone use cats on a purely off-road vehicle??

[Deuuuce]

I replaced them for the ~8 RWHP the MF HF Cats provide, but I thought they were after-market replacement cats at that time. Live and learn...

I've never understood making "off-road" cats, either. Why would anyone use cats on a purely off-road vehicle??

My car dyno'd 385hp/382tq with the hi-flows. My buddies '07 with flowmasters and suitcase removed dyno'd 380hp/370tq. (both had CAIs). We think the high flow cats allowed the 12ft lbs of torque differential. My tuned numbers are 398/422 and 413/432 on race gas. I believe my torque figures are enabled by both the high-flow cats AND the manifold spacers.

SRT Engineers have stated the cats are the biggest restriction in the exhaust system.

As far as "off-road" statement, the HAVE to say that. Just like heads, cams, superchargers, turbochargers, etc, unless CARB certified (rare), they are ALL for off-road use only. And we all know they are on the street....

[hemiitis]

In addition to the two previous codes, today I'm getting a P0133. Maybe that's showing up now since I'm leaving the rear O2's on all the time...