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Heck yeah! aFe & ARH are the only two C8 CARB headers. The install really isn't that bad either, I did mine out in the garage; no need to remove the bumper or even lift the car. My header thread lists all the instructions & tools you need.
https://www.corvetteforum.com/forums...port-cats.html
Originally Posted by MarkMeHopeful
Ian,
I bought a Borla S-type exhaust with black chrome tips from Meraki Autoworks on 2-12-2022 (see posts 96, 100). My C8 is a 2022 model year. Does it have the exhaust with the wrong heat shield? Since the exhaust is already installed on my C8, I wouldn't care except that I have been having trouble with the exhaust and I wonder if this could possibly be the cause.
The problem: My S-type exhaust was installed by the Master Corvette mechanic at Rydell Chevrolet in Northridge, Calif. on 3-9-2022 and he performed the re-learn procedure after the installation. A couple of weeks later my car threw some exhaust system error codes and got a CEL. I took it back and had them do the re-learn procedure again. That fixed the problem for a few weeks, then it got the error codes and CEL again. I just lived with the errors for a while while I did some other work on my car (PPF, splitter and side skirts, etc.).
I just took the car back to Rydell last week for a warranty problem with the front lift system and asked them to do the valve calibration procedure one more time. I promised them that it would be the last time - if I still had problems I would contact Borla about a warranty replacement. The car was fine when I drove it home today but now I'm wondering if the problem could be related to this heat shield issue for 2022 C8's.
If the heat shield could be at fault what should I do now? If it is unrelated and I get more error codes and another CEL I will contact Borla directly about a warranty repair/replace. Thanks in advance.
Hey Mark, hopefully this last visit to Rydell fixed the issue. If not, Ian is on this thread and hopefully he can jump in and advise. Hang in there...
Can you clarify for me - you mentioned an official GM accessory - you're not talking about the borla exhaust that's available on the GM accessories website are you?
There apparently is a "GM version" available through there, which is different from the stype and atak. But you mentioned yours was an stype so just wanted to clarify.
The GM Version is what I’m referring to. I was told it is the S-Type by Ciocca.
That is correct, GM made a change to the OE heatshield on the 2022 Corvette and the new heatshield just barely interfered with our exhaust. While it was possible to modify that heatshield to make our original design fit, we have already updated the design of our C8 systems and the same part numbers will now fit the 2022 model. Any new systems that we manufacture now will have the updated design.
@Ian@Borla I had the GM Accessories exhaust made by Borla put on my 2022 C8. Haven’t had any issues so far (about 2 months). Does that have the updated heat shielding?
Appreciate the reply. How will we know up front if it’s the new design? Would hate to have mine arrive and install is stopped due to the size issue.
Any system manufactured in May or later will have the updated design! The date will be on our box.
Originally Posted by MerakiAutoworks
Yes best to contact us directly to get ETAs for the specific unit you want to pre-order.
Hey Ian,
Just to confirm, if the exhaust has not shipped from the Borla facility yet to your suppliers/distributors is it safe to assume that they are all going to be the new design?
-Josh
If it hasn't shipped yet, it will be the updated system. Anything made in May or later will have the updated design.
Ian,
I bought a Borla S-type exhaust with black chrome tips from Meraki Autoworks on 2-12-2022 (see posts 96, 100). My C8 is a 2022 model year. Does it have the exhaust with the wrong heat shield? Since the exhaust is already installed on my C8, I wouldn't care except that I have been having trouble with the exhaust and I wonder if this could possibly be the cause.
The problem: My S-type exhaust was installed by the Master Corvette mechanic at Rydell Chevrolet in Northridge, Calif. on 3-9-2022 and he performed the re-learn procedure after the installation. A couple of weeks later my car threw some exhaust system error codes and got a CEL. I took it back and had them do the re-learn procedure again. That fixed the problem for a few weeks, then it got the error codes and CEL again. I just lived with the errors for a while while I did some other work on my car (PPF, splitter and side skirts, etc.).
I just took the car back to Rydell last week for a warranty problem with the front lift system and asked them to do the valve calibration procedure one more time. I promised them that it would be the last time - if I still had problems I would contact Borla about a warranty replacement. The car was fine when I drove it home today but now I'm wondering if the problem could be related to this heat shield issue for 2022 C8's.
If the heat shield could be at fault what should I do now? If it is unrelated and I get more error codes and another CEL I will contact Borla directly about a warranty repair/replace. Thanks in advance.
I'm sorry to hear you're having issues with a CEL! The heatshield touching would cause an annoying rattle, not a CEL. Have you reached out to our Customer Service team? If you haven't already, please email our Customer Service Manager! His email address is ChrisB@Borla.com.
@Ian@Borla I had the GM Accessories exhaust made by Borla put on my 2022 C8. Haven’t had any issues so far (about 2 months). Does that have the updated heat shielding?
To my knowledge, the GM Accessories system did not need to be updated!
I'm sorry to hear you're having issues with a CEL! The heatshield touching would cause an annoying rattle, not a CEL. Have you reached out to our Customer Service team? If you haven't already, please email our Customer Service Manager! His email address is ChrisB@Borla.com.
Ian, thanks for clearing that up. I haven't contacted your customer service yet because they just did another valve re-learn on my C8 yesterday. Hopefully that will clear up the problem but the dealer's mechanic wasn't very hopeful. If it gets another CEL I will definitely contact ChrisB.
To my knowledge, the GM Accessories system did not need to be updated!
Thanks! One last question. I’m hearing different things. Is the GM Accessories Borla system on my C8 basically the S-Type or is it a newly developed system specifically for GM?
Ciocca told me it was the S-Type. I have the GM Borla on my C8 and it doesn’t sound quieter than the S-Type.
Go up and read post 146, where I show the Borla dB specs for NPP, S-type and ATAK. Then read post 147 from Ian@Borla about how loud the Borla GM exhaust is. Finally post 151 from Ian@Borla with dB specs for the Borla GM exhaust. Who you gonna believe about a Borla exhaust - Ciocca or Borla? Have you listened to the S-type in person, next to your C8 and compared them in different modes?
Go up and read post 146, where I show the Borla dB specs for NPP, S-type and ATAK. Then read post 147 from Ian@Borla about how loud the Borla GM exhaust is. Finally post 151 from Ian@Borla with dB specs for the Borla GM exhaust. Who you gonna believe about a Borla exhaust - Ciocca or Borla? Have you listened to the S-type in person, next to your C8 and compared them in different modes?
I just read it. All I can say is my ears tell me it’s noticeably louder than the NPP. I can listen to the radio at a normal volume and still clearly hear the exhaust in track mode (I only drive with the exhaust in track). If the S-Type is 9db louder than the GM Borla, I can honestly say I wouldn’t want it. The GM version gives a perfect balance of bad *** sound when you want it while still being able to drop it down to tour mode for a quieter cruise if you ever wanted.
I used to drive my C8 with the exhaust in track mode when I had the NPP. Now, with the Borla S-type, sport mode is plenty loud and I save track mode for more spirited Z-mode driving. I'm sure yours is plenty loud, though. Your thinking is the same that kept me from ordering Borla ATAK. I thought it would be too loud. I'm not sure what I would have ordered if the Borla GM product had been out when I ordered my exhaust. I think we can agree that Borla make exhaust for the C8 that sound great - deep and a little exotic.
The information that was posted by Ian@Borla does indicate that the GM Borla in the Track setting is louder than the NPP in track setting by 3.7 dB. Here is what was posted by Borla - the GM Borla number was in a different post, but still by Ian.
"The Stock NPP exhaust averaged 86.6 dB in Touring mode and 89 dB in Track mode.
The S-Type averaged 92.4 dB in Touring mode and 101.3 dB in Track mode.
The ATAK averaged 100.9 dB in Touring mode and 104.4 dB in Track mode.
Using the same test standard, SAE J1492, the GM Borla system averaged 92.7 decibels in Track mode. It's only a bit more aggressive than the stock NPP exhaust."
And, as pointed out in a post (I think in a different thread) by Zymurgy, 3.7 dB is generally perceived to be louder by something a little greater than 23%, so the GM Borla system should be noticeably louder than the NPP system - and that is substantiated above by someone that has one.
The loudness factor of 1.23 (23%) increase in loudness results from tests where the volume of a single tone is increased by 3 dB. - But in the case of the Borla system, there may be more going on. Some who have installed the GM Borla system report being very happy with it. I believe its described as favoring lower frequencies, and the Borla website says they do some "polyphonic" tuning like a cord on an organ, to emphasize certain sounds. So not only is the sound louder by 3.7 dB, but I suspect that it has a different tonal quality that will affect the perception of loudness. And, while lower frequencies (at least a constant tone) are generally perceived as not as loud at the same pressure level, in this case I think the sound may be perceived as more powerful, more satisfying, and even louder (based on some of the reports).
Here is a table (that I also posted in a related thread) showing perceived loudness for increases in dB sound.
The information that was posted by Ian@Borla does indicate that the GM Borla in the Track setting is louder than the NPP in track setting by 3.7 dB. Here is what was posted by Borla - the GM Borla number was in a different post, but still by Ian.
"The Stock NPP exhaust averaged 86.6 dB in Touring mode and 89 dB in Track mode.
The S-Type averaged 92.4 dB in Touring mode and 101.3 dB in Track mode.
The ATAK averaged 100.9 dB in Touring mode and 104.4 dB in Track mode.
Using the same test standard, SAE J1492, the GM Borla system averaged 92.7 decibels in Track mode. It's only a bit more aggressive than the stock NPP exhaust."
And, as pointed out in a post (I think in a different thread) by Zymurgy, 3.7 dB is generally perceived to be louder by something a little greater than 23%, so the GM Borla system should be noticeably louder than the NPP system - and that is substantiated above by someone that has one.
The loudness factor of 1.23 (23%) increase in loudness results from tests where the volume of a single tone is increased by 3 dB. - But in the case of the Borla system, there may be more going on. Some who have installed the GM Borla system report being very happy with it. I believe its described as favoring lower frequencies, and the Borla website says they do some "polyphonic" tuning like a cord on an organ, to emphasize certain sounds. So not only is the sound louder by 3.7 dB, but I suspect that it has a different tonal quality that will affect the perception of loudness. And, while lower frequencies (at least a constant tone) are generally perceived as not as loud at the same pressure level, in this case I think the sound may be perceived as more powerful, more satisfying, and even louder (based on some of the reports).
Here is a table (that I also posted in a related thread) showing perceived loudness for increases in dB sound.
love this post and thanks for putting the time into it. Everything you said is 100% accurate to how I feel about the GM Borla. The numbers don’t say it’s tremendously louder, but everyone that hears it in person loves the sound and they all agree that it has a lower frequency and deeper tone than NPP. I think it’s the perfect exhaust system for the C8 if you’re not looking for over the top look at me loud.
Hey all! I have yet to see any YouTubers cover this GM Borla exhaust, so I made the following video of warm start ups and driving a bit around town to give people an idea of how it sounds compared to NPP. Make sure to watch the video with headphones on or connected to an external speaker for best results.
Had the Borla Attak installed in March 2022. I have noticed the annoying Rattle. Is there any solutions or recommendations on how to manage the issue with the changes to OEM heatshield you spoke about? System is incredible and awesome addition. But if you have suggestions please update
Last edited by Rferg1169; Jun 6, 2022 at 11:40 PM.
AWSM_06 (see posts here) had a rattle under certain circumstances and it turned out to be one of the valves. He got a new exhaust under Borla warranty. I have also read here, and confirmed by Inn@Borla, that there was a problem with Borla exhaust on 2022 C8's that had to do with the heat shielding (Borla's, not OEM) that would cause a rattle. Borla has since come out with a new exhaust for 2022's. I'm not sure what changes to the OEM heatshield you are referring to. One of the recent posts?
Had the Borla Attak installed in March 2022. I have noticed the annoying Rattle. Is there any solutions or recommendations on how to manage the issue with the changes to OEM heatshield you spoke about? System is incredible and awesome addition. But if you have suggestions please update
Yes. Call Borla. If its because of the heat shield issue, they will help you., according to other posts.
Just installed my Borla Type-S exhaust & already looking at Sport Cats. For those already running Borla, what aftermarket cats did you go with? I just want to make sure fitment isn't a problem.
I was thinking about Soul Performance but just started my research.. At this point I'm looking for something the max HP gains. With that said, I'm not sure if you can even feel 17 extra hp & limited weight reduction?
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
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