It's a lot more fun to put on new tires or graphics but sometimes you gotta do the routine stuff. Repacking your muffler improves performance (slightly) and reduces noise. Less noise = more riding area. So make this a part of your regular maintenance.
The "chrome pipe and push rod" are referred to as a silencer or in MotoSport lingo just an "exhaust". If you search under Exhaust and put in the make, model and year of your bike you will see the available parts. Some are listed as "complete" and will include the head pipe. Look for the ones that say "slip-on exhaust".
Of course, you won't need the packing if you buy a new exhaust; it will have new packing installed when you receive it.
Unfortunately the stock pipe is not a packing type exhaust and this will not work in it. It uses internal baffles and diffusers to control the sound output. If the exhaust has become increasingly loud it is time for a new exhaust.
Carbon Fiber Canisters do not require special packing, this will work just fine. I will add though, you should never allow the packing to break down in a carbon can, changing it often will increase the life of your exhaust.
No it will work with a 4-stoke as well. However it will blow out the packing fairly quick. The FMF packing is cheap but will not last as long as others. FMF makes great stuff this just isnt a great choice for a 4-stroke.
We actually don't stock the fmf packing you're talking about, it's the FMF Performance Packing. We can special order it in for you. My buddy loves using the stringy packing, and he says it makes it a little easier to pack than the mat type packing.
The "stringy looking stuff is the muffler packing. Most muffler packing is the same regardless of muffler brand. I have used the FMF packing on my 2009 KX250F for a while and it works fine on my stock muffler. Replacing the packing is an easy process. Remove the muffler insert, remove the old packing, wrap the new packing around the insert, secure with heat resistant tape and reinstall. Takes about 10 minutes. And, your bike will be a little quieter.
I race GNCC and IXCR races and they last 2 hours...I usually repack every 4 races just to give me max performance...i would recommend like 20 hours...I dont really see the need to after 4 hours if you just ride...I use the fiber packing that comes in strings it looks like...you can use the roll but i think the stringy kind last longer
Repacking depends alot on how much you ride and your engines shape. you normally want to repack after about 30 hours but like i said it depends on how much you ride. Alot of motocross guys repack after every race day because of high reving you are buring oil. A good way to judge when you need to repack is it you see alot of black smoke coming out, loss of power and if your exhaust gets a hollow sound.... hope i was of help