Two bros run great but not much quieter. You could run a BBR D2 with a cancel core insert, BBR has a video on their site of it and it seams really quiet. A two bros quiet insert doesn't make much difference.
It depends what style head you have. crf or klx. if you have a klx style head you would get the klx pipe, but if it has a crf style head then there is no pipe that will fit. you could try a crf50 pipe but i dont think it will bolt up to the frame, or there is a crf70 pipe you could try.
Had an old engine, frame and swing arm I thought I'd make use of, going to reinforce the frame as its probably made of cheese, recently picked up a set of forks, wheels and plastics cheap and will slowly turn this into a roller.. Eventually i'm planning on converting to electric, using a qsmotor...
I bought my son a used Coolster 110cc pit bike it is in great shape other than the front suspension. The upper fork is dented pretty bad and suspension is stuck. He is 6, so I am not trying to spend much money Can anyone recommend an inexpensive replacement?