296 Exhaust DB on sound-limited track

It would be interesting to know the install cost as it is a full bumper removal and a fair bit of fiddling around

 

will keep u all posted

 

Here’s an update for you:

1) I did get the 250 cel sport cats from Capristo. While I like the result, I have to admit it’s really not that much of a difference. To put it in numbers, maybe a 20% increase at some RPMs. But overall not that noticeable, and uncertain it’s worth the $4500 + labor. See the new video I recorded today and check out the OEM video I recorded about a month ago.

Sport cats:
https://photos.app.goo.gl/uTdrfRR4sv76dTud7

OEM:
https://photos.app.goo.gl/9pYzZszeJzS3zTWm8

2) I’ve decided to NOT get the tailpipe conversion kit. While it’s suggesting an additional 3db, I just don’t trust that it will be worth the $6900.

3) I have a feeling that in order to really change / increase the sound of this 296 exhaust, one needs to go for the full system like what Novitec offers. At about >$20k, it’s one expensive upgrade and for now I’m going to live with the current setup which I think is pretty good.

Hope this is helpful

 

I have not heard the novitec in person, but I will offer my initial reaction to that exhaust. I don’t think it improves the quality of the sound. It’s louder, yes, as it does away with the gpf. That’s likely what is holding you back the most at this point. There is no x pipe for the 296, and that would really help with crafting the extra exhaust flow. The quality and tonality of the base car is pretty darn good. The extra 20% from the sport cats sounds like a good return. No cel?

 

812SF or 812GTS?

 

Agree on the Novitec results. But that's the thing: I think it would be great if it was louder, precisely because the tone is cool. I just don't think it's worth the $20k + labor.

Reg CEL, I didn't mention it on the update. So I did get it initially, but then it went away after a few pretty spirited drives. I'll keep monitoring...

 

812 GTS, since they all come with the GPFs

 

It doesn’t matter. I changed the x pipe on an 812SF and though pitch was higher, the car was less loud. Need sport cats on either.

 

Of course it matters- Most 812SF’s (all except part of last year of production) don’t have the particulate filter. All 812GTS do. The particulate filter create a whole set of issues.

 

I've had both a pre-GPF SF and still have a GTS. I changed the X pipe on the SF, and it had a great high pitch tone, but it lost all drama in the low range and downshifts. I'd say it cut it at least 50%, and I was not happy. The X pipe needs a higher flow of exhaust from the cats, so to get the most out of it, you need sport cats at least. It doesn't matter if you have GPF or not, the result will not be as expected. In stock terms, yes, the non-GPF cars have a bit more sound, but it's not a dealbreaker as it is Pista vs. F8. GPF doesn't seem to have as much effect on the V12s, though you can tell it is there.

 

There are ICU issues when changing to sport cats on PF cars (812GTS). Numerous discussions on the board. See posts from Maranelloalltheway. Buyer beware.

 

The Capristo option seems the way to go. Retains a more open GPF or something like that.

 

It’s more complicated than that.

 

That’s fine. I believe it doesn’t throw a cel. No need for a deleter or tune.

 

More complicated than that.

 

lol. Above my pay grade. If it works and is safe, and sounds better? Perfect

 

And may eventually blow the engine… Your car. Do as you please. For others- caveat emptor.

 

What evidence is there of that? Has it happened?

 

can you please elaborate? Are you saying that putting a sports cat on GPF cars can potentially have catastrophic consequences?

 

I mean, less likelihood of a blown engine when gasses can be expelled faster.

 

Prior comments on the issue of going sport cats on the 812GTS…

“GPF/OPF based cars have far too many electronics that are more sophisticated than standard catalytic converter cars. While in practice, US doesnt monitor the effectiveness of these filters, there is no way to disable them because their functionality is directly integrated with how the ECU controls the fueling of the car among other things. The back pressure with GPF cars is completely different. Removing those bricks will immediately throw the car into chaos. I dont care what some tuner shop says, I wouldnt do it without a proper ECU tune that properly calibrate all ECU tables.”


“If you have a car with GPF, every now and then will run a cycle to clean out the GPF, which involves running the mix very rich and getting things in the system very hot to burn off the buildup on the GPF. If you remove the GPF - which I think this setup does, unless they replace the GPF with another- then you may end up causing other damage. I would not be making changes without also adjusting the other side of the equation, which is the ECU.


I'd say you have to tune your 812 GTS if you are touching the particulate filters and catalytic converters. The change will absolutely impact back pressure causing the car to run too lean. N/A engine like the V12 with such high compression ratios may not like running that lean for that long.”

MaranelloAllTheWay- these may have been your comments. Can you add to this? I thought you also stated this could possibly cause engine damage?

 

I believe that’s true. I have been warned but I am not an expert on this so I would recommend preceding with caution. Doing sport cats will void the engine warranty- therefore know what you are giving up if your car is still under warranty.

 

AFAIK Porsche deletes the PPF/GPF on US bound models (because why install an expensive, but unnecessary, apparatus), but they replace it with a contraption that perfectly replicates the same backpressure, since the engines are tuned to run with said PPF/GPF.

 

I thought the 992.1 gt3 and gt3rs all have gpf?