Porsche-Suchtig

I’ve tried to read every thread I can find on this issue. But I couldn’t find an answer to my one question:

What modifications void the 10-year warranty?

My car is currently stock. I’d like to make a few mods for track use:

Springs
Drop links
Control arms
Tension arm
Side muffler delete (to reduce heat on rear tires)
Roll bar
AP rotors to replace PCCBs

That’s pretty much it. Nothing crazy.

With these mods, will Porsche honor the engine warranty if/when the FF issue arises?

KA 991 GT3

The only thing I can see them fuss about are the side muffler deltes. I would not do them to be honest unless you are going with the Dundon setup with their street headers. Removing them will reduce low end torque and you will feel it. Everything else is suspension related and won't affect your engine warranty.

GrantG

Seems like you'd be ok. I think things like Slick tires and internal engine mods (or ECU changes) would be more problematic.

Porsche-Suchtig

That’s more or less what I was thinking too.

On the low end torque issue, are the valved side deletes also likely to reduce low end torque?

itrsteve

Nobody has ever came out with a definitive list.

Remember, this is free warranty work for the dealership so they're typically on your side. I brought mine in with a sharkwerks bypass, but that was it.

They did ask if I had an ECU flash and that was only to let me know that it would be erased through their diagnostic process but that's it.

KA 991 GT3

I am not too sure, I would call up someone with better experience with these cars. The one I had was with a friend's .1 and when we put the side mufflers back on, his car regained low end grunt and he was able to feel it.

RDCR

I have a Track nanny valve controller in my car and one of the settings is exhaust valves open all the time. I've never been able to feel any torque difference open or not. The .1s don't have all that much torque below 5K to begin with.

Alan C.

I had all of the things the OP noted and never had an issue with my dealer.

ipse dixit

yes

pranqster

Other than the exhaust, Do the Springs, Drop links, Control arms, Tension arms affect rear wheel steering? Or does rear wheel steering recalibrate?

That is the question that I would find out before changing things.

Stealth 993

You will be fine with those mods. They will not care about suspension stuff at all on a engine issue.
Mods have to be related to the failure.

When I was researching exhaust, it was doing a center muffler delete affects HP and torque. The side deletes are free and you just loose weight, and gain more sound.
I would not be worried about cat back exhaust affecting warranty. Headers and other engine mods are iffy.

Porsche-Suchtig

These are pretty much THE standard track upgrades. I don't know how the rear steering works. But the suspension upgrades were developed by race engineers that I know from my days racing. I've trusted their judgment in the past and it's worked out well.

As for the side muffler delete I've decided not to do it. From what I've found so far, I don't think it will void the 10-year warranty. But I also have not found any data to support claims made about heat reduction. (Seems logical but how much does it really reduce temps by and for what period of time? Weight reduction, on the other hand, is verifiable. But $1,500+ to reduce weight by 30+ lbs is a little steep. I could just remove the passenger's seat for free on track days. But in all seriousness, I no longer care to compete. And a 35 lb weight reduction is pretty meaningless for DE.

Tom@TPC Racing

Regarding side delete pipes losing low-end torque, it really depend on the design of the pipes. If the side delete pipes are the non-valved Cup car type, which are basically just elbow pipes, then yes it does lose some low end torque at under 4000rpm particularly during part-throttle when the exhaust gas flow volume is too low to fill the big pipes for optimum flow velocity vs. engine load. In other words, at part-throttle under 4000rpm the exhaust flow volume is about that of a 2.0L economy car engine so 62mm bypass pipes would have an adverse affect at this particular engine load range. Whereas the valved version channels the smaller volume exhaust flow through the smaller diameter, longer travel length pipes, with bend(s) that are favorable for torque production at this particular engine load range. There are small differences between how the different brands of valved-side delete pipes are designed; some maintains same amount of torque as OEM side mufflers, some can even gain...

Sorry to OP for off topic.