Conflicting aftermarket catback info...

BlaqWhole · 07-03-2017, 03:34 PM

Ok so I am looking for a catback and I keep getting conflicting info on AFM and the NPP valves. Here is the info...

1- Some say you can just tie the NPP actuators out of the way without getting a code while others say you can't and you WILL get a code. MBRP has brackets that supposedly eliminates a code but it is just a bracket. So why would it throw a code just from being tied away? Is it that sensitive that it will code you unless it is connected to a bracket that does absolutely nothing?

2- AFM valves...WTF does this have to do with the exhaust? I keep hearing that ALL aftermarket exhausts somehow eliminate the AFM or something and that'll throw the ECU off. Is this true?

So basically, those of you who have done aftermarket catbacks...which system did you use? Did it eliminate AFM? Did it eliminate NPP? Did you have to hang the actuators? If so, did you get a code? I been trying to sort thru all this for a while and the more I look it up the more confused I get. Even the descriptions of the exhausts are not clear on what is what. Any help is appreciated as I plan to order either MBRP or Magnaflow on Wednesday. Thanks guys.

edc901 · 07-03-2017, 03:36 PM

Mbrp has a bracket so that the acuators are still plugged in to hold them up.

ZL1 don't have AFM so don't worry yourself with that. Just buy a kit that does not include them or is specified for a manual SS

BlaqWhole · 07-03-2017, 03:54 PM

Quote:

Originally Posted by edc901

Mbrp has a bracket so that the acuators are still plugged in to hold them up.

ZL1 don't have AFM so don't worry yourself with that. Just buy a kit that does not include them or is specified for a manual SS

Oh thank God!! Finally some answers, lol!! Thanks man! I swear, even some of the companies I talked to don't know all the details.

somewhatdamaged · 07-03-2017, 03:58 PM

If you go with another brand with no NPP, you can just zip tie the actuator connectors out of the way, and cover them with electrical tape. I did that for my Borla Atak, no NPP. The actuators themselves can stay on the stock exhaust.

bucknut2006 · 07-03-2017, 04:35 PM

Quote:

Originally Posted by edc901

Mbrp has a bracket so that the acuators are still plugged in to hold them up.

ZL1 don't have AFM so don't worry yourself with that. Just buy a kit that does not include them or is specified for a manual SS

I have been trying to figure this out but really haven't seen anything. So the ZL1 doesn't have AFM or just not the rear valves? I know the Corvettes show V4 mode in the display, but haven't seen that on the ZL1 so wasn't sure.

nicktechla · 07-03-2017, 05:05 PM

ahh i was wondering too, i kept getting mixed answers about AFM

TJay74 · 07-03-2017, 05:24 PM

If you unplug the NPP actuators you will get a soft code that is stored in the ECM, it doesn't trip the light but only references that the actuators are not working.

BlaqWhole · 07-03-2017, 07:03 PM

Quote:

Originally Posted by bucknut2006

I have been trying to figure this out but really haven't seen anything. So the ZL1 doesn't have AFM or just not the rear valves? I know the Corvettes show V4 mode in the display, but haven't seen that on the ZL1 so wasn't sure.

Quote:

Originally Posted by nicktechla

ahh i was wondering too, i kept getting mixed answers about AFM

What had me confused is that some of the online retailers are saying it does. But I did some digging and the ZL1 does NOT have AFM. According to Mr. Wyndham as confirmed by Al Oppenheiser. See the link below...post # 26.

http://www.camaro6.com/forums/showth...=479313&page=2

mdmoore23 · 07-04-2017, 02:59 AM

I can't believe so many retailers didn't know the ZL1 doesn't have afm.

07-03-2017, 03:34 PM	#1
BlaqWhole Account Suspended Drives: 2017 Camaro ZL1 A10 Join Date: May 2012 Location: NJ Posts: 7,692	Conflicting aftermarket catback info... Ok so I am looking for a catback and I keep getting conflicting info on AFM and the NPP valves. Here is the info... 1- Some say you can just tie the NPP actuators out of the way without getting a code while others say you can't and you WILL get a code. MBRP has brackets that supposedly eliminates a code but it is just a bracket. So why would it throw a code just from being tied away? Is it that sensitive that it will code you unless it is connected to a bracket that does absolutely nothing? 2- AFM valves...WTF does this have to do with the exhaust? I keep hearing that ALL aftermarket exhausts somehow eliminate the AFM or something and that'll throw the ECU off. Is this true? So basically, those of you who have done aftermarket catbacks...which system did you use? Did it eliminate AFM? Did it eliminate NPP? Did you have to hang the actuators? If so, did you get a code? I been trying to sort thru all this for a while and the more I look it up the more confused I get. Even the descriptions of the exhausts are not clear on what is what. Any help is appreciated as I plan to order either MBRP or Magnaflow on Wednesday. Thanks guys.

07-03-2017, 03:36 PM	#2
edc901 Drives: 2017 ZL1 Join Date: Mar 2017 Location: Memphis Posts: 95	Mbrp has a bracket so that the acuators are still plugged in to hold them up. ZL1 don't have AFM so don't worry yourself with that. Just buy a kit that does not include them or is specified for a manual SS __________________ 2017 Camaro ZL1 Hyper Blue - A10

07-03-2017, 05:05 PM	#6
nicktechla Drives: 2012 Porsche 911 Turbo S Join Date: Jan 2017 Location: Los Angeles, CA Posts: 1,776	ahh i was wondering too, i kept getting mixed answers about AFM __________________ IG: 2fast2nick -- Current -- 2012 Porsche Turbo S - PDK - Basalt Black Metallic -- Past -- 2017 Camaro ZL1 Coupe - Red Hot - A10, PDR - HRE P101 2015 Mustang GT PP - Whipple Supercharger

07-03-2017, 03:58 PM	#4
somewhatdamaged Drives: 16' 2SS M6 Join Date: Feb 2010 Location: Earth Posts: 573	If you go with another brand with no NPP, you can just zip tie the actuator connectors out of the way, and cover them with electrical tape. I did that for my Borla Atak, no NPP. The actuators themselves can stay on the stock exhaust.

07-03-2017, 05:24 PM	#7
TJay74 Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016 Location: Norman, OK Posts: 2,424	If you unplug the NPP actuators you will get a soft code that is stored in the ECM, it doesn't trip the light but only references that the actuators are not working.

07-04-2017, 02:59 AM	#9
mdmoore23 Drives: 2017 ZL1 Join Date: Jun 2012 Location: Graniteville,SC Posts: 646	I can't believe so many retailers didn't know the ZL1 doesn't have afm.

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