pashaj

So does a Cobb tune then void a warranty?

skiahh

When you buy a C2, you buy the vehicle as spec'd. When you buy the C2S, you pay more and buy that vehicle as spec'd, which is for higher power than the C2, so even with common parts, the cars are not spec'd the same.

I have no doubt they share parts, and MM even says that Porsche must prove the aftermarket part caused the damage, but in reality, if you modify the engine to produce more power, the burden will be on you to prove the additional power didn't cause the breakdown.

It's not quite the same as using, say, Amsoil oil or other non-recommended oil. Of course, if you don't use an oil spec'd with the Porsche specification, you're in the same boat. You now have the burden to prove the oil wasn't the cause, rather than PCNA having to prove it was.

If you put a tune on that does, indeed, create 75 more hp, Porsche will have a very easy time of validating their denial of your warranty claim for the engine and entire drivetrain. Both because you used an unatuthorized part and you increased the power output to something beyond what the vehicle was designed and sold as. From the warranty: "If a replacement part that PCNA did not supply is used in maintenance, repair, or modification of your car, and an authorized Porsche representative determines it is defective or not equivalent to the original part, your claim for warranty repair or some or all of your car’s limited new car warranty may be voided."

The x31 is approved by PCNA, thus does not void the warranty.

In fact, if you put on a non-Porsche x31 equivalent power tune, they'd still deny your claim for the engine and most of the drivetrain because the warranty pretty clearly specifies that modifications not approved by PCNA aren't covered (that one's pretty obvious; you can't expect PCNA to warranty someone else's parts) and that those modifications may void some of your warranty.

Yes, removal of the center muffler could void your warranty. You've now made the vehicle out of compliance withe federal emission requirements, so it's an unapproved mod. The small power gain certainly isn't going to damage the car, but PCNA could easily argue that it changes the flow of the air through and out of the engine, thereby making the engine no longer within design spec. Your engine warranty claim could very easily be denied on grounds that PCNA can't/won't work on a non-compliant vehicle (especially with the diesel scandal still going on) and that the unauthorized modification changed the airflow design of the engine causing it to fail. Not hard to prove that burden on their part, really. I agree that because the power increases of muffler removal are pretty slight, a drivetrain warranty denial would seem to be a bit of a reach, though.

Good luck on your warranty, though. I hope you have the means to force Porsche to actually prove any failures you have with your chosen mods... or defend those that clearly change the vehicles design spec.