Make your own. Buy a cheap chinese bike exhaust from eBay, cut your current exhaust off (leaving the part the attached to the engine, and the pipe) and then weld it on. THat's what I did, I gained a lot of power.
help me any one please i tred to take the cover off of my exhaust undid the screew and the bottom didnt fall off what should i do . i know its saids to clean it allready had to clean my spark plug cant wait untill its broke in than i can start useing 40:1
edangel- Try running it with the screws removed, it may just blow off. I would go to 40:1 now, and not wait until you've covered the piston, head, and exhaust internals with carbon and oil sludge.
edangel...look on the sides of the cap and see if its been tack wielded...alot off these are because they fall off so easy...if thats the case you'll have to grid he wields down until it falls off...good luck...Dennis
The cap on mine was EXTREMELY hard to move. I ended up taking it to my friends house, putting it in a vice, and smashing it with a hammer from different angles until it started to move.