Who/what is "x car"?

I would install fuzzy wheel well liners if I could find anything. Ideas on where to source the material?

 

E63 has fuzzy rear liners.
I figure they could be trimmed to fit and attached to brackets with push fastners, for easy removal before a track day.
You would need to leave abit of clearance around the edges since the mufflers will move a little bit with the engine.

 

I would think the airflow is used to cool the side mufflers.

If you really want to put something in the wheel well, I would suggest an aluminum sheet sprayed with some sort of underbody coating on the wheel well side. And, with 5-6 small slats cut into it so that some airflow continues to get to the muffler.

 

One year update. It happened again. Factory rep evaluated the vehicle. "witness marks" are there from the prior event and they found more stones.

This time more "witness marks" and one that scored the rotor to a minor degree and numerous others. Service Manager first asked me if I drive on gravel roads. I don't.

Factory rep lives near me, was promoted from the dealership and is a good guy. Said PCNA does not have or plan a remedy. He sees more of this after winters from the gravel mix highway crews put down in NJ. Also HP tires are sticky and tend to throw them up to a place in the rear that catches pebbles. It is easy to get your hand up there to release them. They will show me how to DIY. Will let you know what they teach me. Looks like a new maintenance item for my 991S.

Anyone else have this issue too???

 

Driving on sand/gravel roads in a Porsche? Buy a truck!

 

All my driving is on paved roads State roads. But thanks for the comment.

 

I cringe, if driving on a road with any loose debris. I'll know immediately by the sound of rocks hitting the side mufflers. I'll slow way down immediately, mostly because of how easy the paint chips (even with full Expel).

Thanks Zelig, for letting us know there other reasons to use caution on dirty roads.

 

I always thought it was the sticky tires and wheel liner. I thought they had no liner to cool the mufflers and underside of the car. Yeah rocks get under the heat shields in the back of the car. My solution go very slow and use the air compressor to get the rocks/pebbles out of the back end of the car.


Retractable wheel well covers!! A mere $2k option.

 

Mufflers do not need to be 'cooled', how did you guys come up with that notion? You can get any exhaust system red hot and it will function just fine.

Porsche is all about weight. Wheel liners add weight and another layer of complexity, simple as that, and to be effective at noise reduction they would have to be insulated which adds even more weight. My Aston Martin Vantage had insulated rear wheel liners, they were not evident until you pulled them off but they were quite effective at dampening cabin noise from tire roar. A modern car has so much safety equipment in it (all those airbags) and consumers want fancy, heavy power seats and electronics in their cars, that performance manufacturers have a real struggle with weight, as that affects performance. Look at the some of the GT series or Boxster Spyder. Radio Delete, No Air Conditioning, no Sunroof, strap handles for door closures, simple seats - all in that chase to get the pounds off the car.

That is really my one and only gripe about the 991, the road noise from the rear tires - its a bit annoying on the interstate. I'd buy a full set of insulated wheel liners if there was an aftermarket vendor that offered them (Opportunity!). I may just pull off the partial front liner and line it with some Dynamat when I need a project, that might reduce the tire/road contact noise some

 

Boom Mat Floor and Tunnel Shield Insulation. High heat, stick on, looks good, and doesn't weigh much. Also, maybe some closed cell foam in back, just not sure how it would look under the carpet.02 T

 

I did that to the front and partial rear liners. The results are good and the noise definitely has been cut down. But the lack of full rear liners still allows for stones to hit the mufflers and it is quite annoying.

 

Good tip then, Brad. Any idea how much material you used? I think I'll order some up...

 

I don't remember exactly, I did it last summer. I think I got around 10 or 12 sq ft and had plenty left over. You can easily estimate it by holding a piece of notebook paper around the wheel well and count off each as if it were one sq ft. This will give you plenty of margin for error.

Be sure to get the thinner, semi-solid stuff, not the super thick foam, since it is in a place that could get wet. As an extra precaution I sealed the edges of mine with a sliver of duct tape.

I peeked at mine recently when doing some brake work and it's all holding on quite well almost a year later.

 

Make a DIY fix! I'm sure lots of people would appreciate it. Or you could take it into a well qualified body shop and see what type of fab work they can do to fix your complaint.

-Luccia