yes i found out from my uncle that steel wool would work better in a aftermarket pipe rather than fiberglass shreds, and it would last forever except sometimes you would have to spray it out with water to clean it on the bright side its cheaper for the people with not alot of money, its only like $4.50 for two bags of steel wool. i have money to buy expensive stuff but other people do not so i find ways for people to save money easier. ohh it would work for a 4 stroke aftermarket pipe too.