http://www.ebay.com/itm/Pod-Filter-...ash=item5b0f7adbb2:g:AoMAAOSwJQdW93mm&vxp=mtr I would look for 50-52mm. They fit better on the H-pipe. Also get the foam end ones as they will flow better. There are dozens of them all over ebay. Search uni pod. I got a set for $35 a while back. If you want a good running bike sometimes you need to spend some coin. Emgo's are the worst there is. That's why they are so cheap.