Guys....i am not 100% ;positive , but i don't think the old pitts from the 44cc and 50cc sport engines are going to work with the new 58 Extreme. The exhaust port alone is over 1-1/2 time the size of a DA-50 exhaust port. Tom really removed a lot of metal out of the exhaust port to let this little sucker breath. I know he has some pitts ( i think the bolt on side dump) for the 58's. It would be cool if Jtec came out with a rear dump and side dump for this 58cc motor.....that way you could buy a pair for the 116 extreme. I use canisters myself though , and that's what i'll end up using on my BME 58......just like the sound a lot better ya know?