Guys, I just bought a 2001 yz 426f. It has a White Bros. E exhaust on it. Is this the stock exhaust? Also the exhaust pipe from about 4 in. from engine all the way to muffler is wrapped in header tape or heat wrap or whatever you call it. It looks like woven fiberglass tape about 3in. wide. Is this normal? I am third owner and the guy I got it from said it was there when he got it about 3 months ago,(he said the bike was too much for him and he is staying with 4-wheelers).