Maybe in the USA configuration, but responses from German companies not so positive except for Schmid, ECU software €1,200 + exhaust hardware.
QUOTES:
9ff:
Unfortunately your car is so "smart" that it detects the removal of the OPF electronically in any case. No "cheating" with cross sections or the like helps either.
Without a change in the DME, a "check engine" will always be activated.
Akrapovic:
As far as we know, you have to optimize the software, otherwise an error will occur.
Speedart:
I currently do not see a way to remove the OPF without Motronic optimization
Techart:
So we can basically help you here, but neither use an empty pipe nor reduce the cross-section of an existing pipe.
What we can offer is to convert the vehicle to an identical vehicle without an OPF, using the Porsche original parts.
It is important to note that your vehicle no longer complies with the legal regulations according to STVZO and the operating license expires. This notice must be given by us and countersigned in advance by you as a customer at AB.
Schmid:
With our OPF simulator specially developed for the 718, we can implement OPF elimination without DME intervention.
END QUOTES:
EU type approval rules require OEMs to install checks that detect GPF removal and Porsche approach is to fit sensors either end of the GPF checking pressure differential. Some others have suggested auto CEL delete software but these still get logged. I don't know if dealer PIWIS picks these up these or whether it requires special access code from factory (when serious engine issues are being investigated). Unless your GPF delete comes with an ECU solution and comfort about heat management back though the system, I'd be cautious about these.