Carbon Fiber Muffler Durability?

I recently purchased a carbon fiber-sleeved muffler for my bike at a pretty good price on eBay.  I love the "look" and lightweight properties of this material, but after I commited to the purchase I began to have some doubts about the long-term durability of this muffler construction.  I'm pretty sure the carbon fibers themselves can stand-up to the exhaust heat just fine, but it's the heat-resistive capabilites of the supporting resin matrix that concerns me.  Just wondering if anyone out there is willing to provide me with some feedback regarding their sucess (or failure!) in using carbon fiber canister mufflers, I intend to keep this bike a very long time so I want this muffler to last.  Any feedback would be appreciated, thanks.  

The CF pipes have been on my bike from 2002 on, and they have held up fine.  It is starting to sound like I do need to re-pack them soon, but they still look good.  

I own the two brothers on a 05 636 and the carbon fiber broke due to the lack of maintenance, they only lasted 18 mos. youre suppose to repack the exhaust every year.  

How do you repack, how hard is it to repack, and what does it cost to repack the carbon fiber exhaust??  

The fiberglass packing material not only absorbs sound to muffle some of the noise, it also insulates the carbon fiber resin matrix of the outer sleeve from the exhaust heat, otherwise it will eventually burn and disintegrate.

Repacking the muffler isn't difficult, but the CF sleeves are usually pop-riveted on, so you'll need the correct size rivets and pop-rivet gun. If you use too small of a rivet, the sleeve will vibrate around the holes and eventually round them out, making it more difficult to keep the sleeve tight. I've seen some people use sheet metal screws, but the problem there is that they can come loose if you don't use a thread locker of some sort, and they will round out the holes if you try to tighten them too much.

You can usually find fiberglass muffler packing at motorcycle accessory shops and some auto parts stores. Be sure to handle the stuff carefully with gloves and long sleeve shirt, otherwise you'll get fiberglass shards in your skin, which will cause you to itch. Not sure on the cost, probably depends on what and were you buy it from.

You basically drill out the old rivets (being careful to choose a drill size that is just a hair larger than the rivet pin), slide off the CF sleeve, pull off the old fiberglass packing, cut and layer the new packing in, replace the sleeve and rivet it tight in place.  

Two Brothers has a nice repack kit for 20 bucks or so, that comes with rivets. I've repacked my TBR carbon can twice, and it is easy.