JCR-Porsche

Comparison coming, we’re back on track on Wednesday so if we get through the test programme in time I’ll shoot the stock exhaust on and test the various combinations

Will do our best

JC

TomTarzian

Thanks, JC. This seems like the definitive test: how do they sound compared to the OEM exhaust?

God bless,
TT

metalone

Agree with you with the reasoning about the valves. I don't doubt they play a role maximizing the efficiency of the emission system, but not in the performance department, or at least not when the valves are closed. This guy of Obsessed Garage took the time to record some data at the dyno, I think that his results can be extrapolated to the GT4/Spyder case. Here's the video


Offering the OPF delete with heat shielding shows above-average concern, so that is a good sign for me . Personally I pay a lot of attention in how an aftermarket followed OEM principles and carry over things related fo fitment like anti-vibration clamps, that others vendors may say that are unnecessary.. of course this applies to this heat protection/dissipation topic which already some aftermakers are saying that are a waste of time (which would make laughing the engineers at Flacht for sure).

After having bad experiences in the past with aftermarkets companies (that I prefer not to mention), Cargraphic has been the only brand to fit my demands, but now I'm looking forward to see if the JCR OPF delete package would meet this criteria as well.. I really hope so because I'm very keen of having all the reducing weight benefits of Titanium pipes, especially in a car like the 718 Spyder.

I also have the feeling that many people with no monitored OPF would go with only replacing the OPF pipes and keeping the OEM muffler, so actually would be very encouraging to pull the trigger hearing a comparison with the OEM muffler.

Cheers,

Westcoast

Regarding heat dissipation, I am following this as well, all but one company (IIRC) have said that on the over axel pipe that it was not needed, but I am inclined to believe that the factory installed it there for a valid reason, dismissing it out of hand seems dangerous, maybe not in the short term as the effects and damage may take time to show but for those of us who keep our cars for more than a couple of years it is a real consideration.

I ran aftermarket OAP on my 2013 Boxster for 3 years and noted no adverse effects, but that was only a 305HP engine as opposed to 414HP, I would think that the more powerful engine produces more heat?

blackholescion

On the contrary, the OPF traps and retains heat whereas a straight through pipe would not. Similarly, the OPF is a large canister that then brings the heat closer to the body.

Jrtaylor9

I look forward to hear that because your 718 clip above has that raspy sound like the 981 (from memory at least), more so than a gt3 whale. Should be a good comparison.

metalone

Cargraphic is offering three types of OPF Pipes, one of them looks like is empty inside, but I'll inquiry to be sure. The main advantage of this is that the fitment is exact, all the OEM brackets and supports will remain to fulfill it's purpose and most important, the OEM heat shields will remain
Link

CARGRAPHIC Otto Particulate Filter Replacement / Housing Set
- without filter insert
- witouht sensor connections
Part No. CARP82GT4OPFER

JCR-Porsche

In combination with the factory rear silencer?

It’s possible to run the pipes without heat shielding, the car will not be damaged and I don’t believe anything surrounding can get hot enough to burn / ignite under even extreme circumstances however there’s still very good reasons to do this. I really wouldn’t be surprised to see some Uturns on those decisions once we present the data

This much is true however it’s easy to measure EGT at various points within the pipe with and without the OPF in place and although there’s a temperature drop the temperature is still significant enough to want to reduce that radiating into the wheel arch

As ever, it’s extremely difficult to capture but on Wednesday we will gather much more footage that I’ll be happy to share so any specific requests please let me know

I believe this is more for the EU market where the cars need to pass visual inspection so an OEM ‘look’ is important. Saying that, still no heat insulation over axle and running that canister design without any substrate is creating its own issues rather than solving them

JC

metalone

Could you please elaborate on what would be the added issues of the empty canister design?.

They offer this for non-EU markets as well. The EU has a high flow OPF inside ( monitored ) and for ROW they offer one with a filter and another empty. I think that the heat insulation consist on reusing the stock wrapping as this are the same shape.

Croc999

wow - this sounds like a great option for our EU compliant cars.
how much does it cost?

VVG

Coming soon it would seem!!

https://www.akrapovic.com/en/car/pro...19&yearId=6126

Croc999

Supersprint also publish some videos of the the product they're building...

_nosubstitute_

It's here... :/ not sure I love it though, sounds like they didn't merge the center bit like JCR and most other options. Those tips do not look good to me, it doesn't match the car / looks kind of looks too JDM.

metalone

It's fake akrapovic according to some comments, and I don't see any akrapovic branding either

_nosubstitute_

That's good, as it sounds below average to say the least. Akra will charge more than anyone, so it better sound the part!