I use this when repacking my Turbine Core II silencer. It lasts as long as any brand of this type packing material that I have tried, perhaps longer. The amount they give you is just the right amount to get the job done. When fresh, the sound is reduced significantly and with a good tone. In order to get maximum life from this product, it's important that your jetting is correct for where you ride. The price is good too, although you can spend more for a fancier product if it makes you feel better. But in reality, you won't get any better performance than the FMF 2 stroke packing provides.