No rear fender liners, aftermarket products? Other tricks?

[Thklinge]

So, the 996 doesn't have any fender liners in the rear portion of the rear wheel arches. It hasn't really been a problem, except for winter driving. Slush and show is thrown on the hot mufflers and burn off when you stop at intersections. I kinda think it's cool with smoke billowing out from the rear arches, others think the car is on fire... Either way, with a new exhaust system a new potential problem occurred, check the vid:

That's after about two weeks of driving. Those mufflers used to be shiny stainless steel. The mufflers themselves can take a bit of dirt but I'm worried about the valves, it looks like that piston might pull a lot of dirt into the vacuum actuator. Does Porsche do any tricks to protect the valves on the PSE exhaust or is there some sort of aftermarket rear-rear fender liner one can buy? Tips appreciated.