Happy Friday.
installing GM borla on my 2023 tomorrow and have a quick question. It does come with 2 front pipes section according to Borla 20-21 have AFM and 22-25 have DFM. How do I know which one is correct for my 2023.

 

https://www.borla.com/?msclkid=7c53a...t=Borla%20Test


Go to the borla website and put in your car info. it will give you some correct options.
1. Do you currently have NPP exhaust?
2. Do you want black, chrome or carbon fiber tips?

 

i have gm version and it came with 2 front pipes section, they look identical but the valves support to be different, i need to know which one i need to install on my 2023
GM part number 19433781

 

I do not know the answer but suggest you contact Borla for the answer. But its news to me that 22-25 have Dynamic Fuel Management (DFM) and not Active Fuel Managment (AFM).
I did look at the Borla site and I see that it does, in fact, say this: "Includes AFM ('20-'21)/ DFM ('22-'25)". Perhaps that means something else.

But AFM shuts down the same 4 cylinders at a time. DFM can selectively shut down cylinders. I do not believe any C8 has DFM. Again, ask Borla about that.

 

I called Borla today and didn’t get any much help. Basically the guy told me I am not support to install myself . dealer install only and dealer should know what to do. I received 2 front pipes section with my system so possibly just a mistake as both look identical

 

Very sorry to hear that about Borla. Everything I have seen on this forum about their customer service is that its excellent. Did they happen to even clarify why it says "DFM"?

 

I didn’t get much out of him beside told me take to the dealer. I also PMed Ian here and was told contact Chris, the manager of Borla but not necessary.

 

No C8 has DFM.

 

The Borla website will not have the GM factory part number and more than likely there is probably only 1 or 2 people,at Borla who worked with GM to certify an OEM GM exhaust accessory developed by Borla…hence the lack of information on the Borla website and lack of knowledge by Regular Borla sales staff.

The correct answer is to contact the Chevrolet parts department and discuss with them if it is compatible with a “NON-NPP” exhaust..,in which this accessory clearly states that it “REQUIRES NPP dual mode performance exhaust” in order to be compatible. If you do not have the NPP performance exhaust on your car, it does not appear that any of the GM by Borla exhaust accessory is compatible with NON-NPP exhaust.

https://www.shopchevyparts.com/chevr...5.html?sort=2a

• REQUIRES Factory Option NPP, Performance Exhaust - Included with (Z51) Z51 Performance Package
• REQUIRES Cylinder Deactivation Exhaust Control Valve Relearn as failure to perform this procedure may result in poor system performance, DTCs being set, or customer dissatisfaction
• For use on Coupe and Convertible Models
• EXCLUDES use on Z06 Models

C8 Corvette Stingray | Exhaust Upgrade System | Cat-Back | Dual-Mode | Polished Stainless Steel Tips | NPP

• Part Number: 19433781

• Brand: Genuine GM+

• UPC: 00195491591776

PS…The Ford Performance Sport Exhaust by Borla for the GT350 is the same issue. It’s a Ford part number but it is not on the Borla website, only the Ford Performance website or vendors selling Ford Performance parts. The OEM GM or Ford parts are typically not on the manufacturer websites for anything. I looked at Borla for the Ford and GM exhaust and nada.

 

@EVERFLY , I thought your question was what the apparent distinction between 20-21 and 22-25 model made by Borla means - and not about whether its applicable to non-NPP systems (its not, or course, but you knew that). So.....did your exhaust system come with information that included that same bizarre statement "AFM ('20-'21)/ DFM ('22-'25) ....", or did you read it on the Borla website. Did your system come with installation instructions or anything that makes the distinction between model years?

I tried to find installation instructions specific to the GM approved Borla system, but could not. However, there are installation instructions on the Borla web site for all of the variants they offer for the C8 (A-36032 Rev. E).
https://www.borla.com/media/installa...ns/A-36032.pdf
Noteworthy is that it is the same set of instruction for all year and all variants they sell on their website - its does not include the GM specific variant, which, as pointed out in an earlier post, does not appear on the Borla website. The instructions address the appropriate differences between the systems with NPP and without NPP. And there are also some differences noted between the S-Type and ATAK-type systems. The instructions include a "Bill of Material", listing the included parts - but there is nothing there about alternate "front pipes". That may be specific to the GM system or...? Or a mistake. Also of interest, their instructions refer to the Cylinder Deactivation Exhaust Flow Control Valves and actuators as DFM valves and actuators throughout. There is nothing in the instructions about model year specific differences - nothing like "AFM ('20-'21)/ DFM ('22-'25)...". C8 LT2 engines do not have Dynamic Fuel Managment - they have Active Fuel Management.

 

both look identical. I think I got 2 as mistake. Different heat shield but the valves inside are same.

 

The OP didn't say his car is non-NPP.

 

That's right. I assumed (perhaps incorrectly) that he knew what he was doing when he ordered the GM Borla system - they only make the version for the NPP option. The image he posted above shows the received two components. I do think that was a mistake, like he said. As he noted the shielding is a bit different. Wasn't there change to shielding necessary at some point? I seem to recall some forum posts where there were issues with the shielding due to a little change - it may have been between 2021 and 2022. Something about the shielding rattling? I'm not sure, but if there was change, I think the revison could be used on all year. Regardless, I can't imagine they would ship two versions like that.

 

The images you posted show the AFM actuators installed on one of them. Did you do that? You did not receive it that way right?

 

There was a heat shield issue with 2022 models that caused Borla to change the design. Turns out I had clipped that post and saved it in my files. Has nothing to do with AFM vs DFM of course. And does not explain why the OP received two versions.

 

excellent find. That explains some
of the differences in exhaust systems over the years.

 

I swapped from my other exhaust

 

The mounting tabs at the bottom (relative to the photo) look different. Not identical. I think only one of these is actually going to fit your car. No idea which one, though.