Waxer

Thinking of headers. Do they come with cats from Dundon or GMG? Will they void warranty?

SupremePower

You can order them with cats but they can void your engine warranty if something fails in relation to the modification installed on your car.

FJSeattle

Nothing voids your warranty.

A dealer can deny a warranty claim due to an aftermarket part contributing to the failure of XYZ. But nothing voids your cars warranty outright.

SupremePower

True I should have been more clear. Updated.

qbix

In EU it will definitely void the watrranty of the engine. i have no clue why but checked that with two dealers. I requested this information with regards to akrapovic system which is often OEM part provider for many models.
This and sound level are only factors that holding me back from getting DMS system (even that I am quite skeptical about power gains ).

Jamie@dundonmotorsports

We offer no cats and catted version
Race is for race cars, doesn't void the warranty, Porsche doesn't mind exhausts, tuning is another question.

Race setup for GT3 is 40whp
Catted (Street) setup for GT3 is 31whp gains

Customers happy all over the world and many real world (drag race) and dyno confirmations of the power gains from Dundon Headers.

Put it this way, we offer a 30 day 100% money back guarantee and not a single one has come back for our 996/997.1/997.2 or 991 systems

James-GMG

Great question and I think there are several answers but my first thought would be to get friendly with your local dealer and ask them how they feel about certain aftermarket upgrades?

We have local dealer to us here in So Cal that have no problem warranting any item on a car with our exhaust upgrades but again, your dealer might have a difference of opinion.

But I do know that we sell our products through many Porsche Dealerships through North America and they are installing them at their service facility before delivering them to their customer, so most dealer seem to be ok with it, but again, it helps to have a strong relationship with your local dealer.

Good luck....and your timing couldn't be more perfect as we are launching our new Motorsport header for the GT3 and RS next week!

PM if you would like some more info.....Cheers!

Alan C.

No tune no issue with my dealer. I spent about an hour behind Matt, Money2536, during the Smokies event. The sound of the Dundon headers is amazing.

Nick Yoskin

A dealer may say "No problem!" but might be a different story once the territory service rep from Porsche makes a little visit to the dealership. Just a thought.

ipse dixit

Exactly.

Porsche NA (or AG) makes the ultimate decision on a warranty claim. If the dealer decides to fix a problem without first clearing it with the corporate offices, then it's on the dealer to either eat the costs or bill the owner for it.

Now, a dealer may massage what the actual problem is when submitting the claim to Porsche NA, but if the labor hours and materials don't jive with the warranty claim paperwork, then all bets are off.

Of course, all that said, at least in the US it is initially Porsche's burden to demonstrate that an aftermarket modification was the cause of the problem. Usually not that difficult, but it is their initial burden.

kyrocks

Keep in mind that these aftermarket headers WILL NOT stand up to the abuse the OEM ones will. Eventually something will fail, a CEL will come on and/or an O2 sensor will need replacing. When that doesn't work, the aftermarket company will refurbish the header for $1000 or so because it isn't warrantied. Ask me how I know.
The performance advantage is not worth this headache for me and neither is a possible warranty denial.

Macca

Unless they are 321SS with lifetime warranty like DMS.

Our dealership sees cracked factory headers on regularly tracked 997 GT3. It's certainly a known issue along with the third mufflers cracking on the welds.

Nothing is forever I guess...

Nick Yoskin

This pretty much this sums it up:
If you don't have tolerance to deal with paying for the claim yourself then leave it stock. Dundon and other vendors will have plenty of customers that will be tolerant.