Would a Pro Moto Billet spark arrestor end cap for a YZ250F (2001-2005) work for a 2003 WR250F with a stock pipe on it?? http://www.promotobillet.com/shop/item.asp?itemid=59 If not, what's a good spark arrestor out there?? nothin to expensive... There any FMF Pipe's..? What would you all recommend thats a fair price that would maybe get more performance out of the bike??