Just to let everyone know, I installed my dynojet kit and hmf pipe (with quiet core) on my vinson last night. Its pretty stealthy at idle but when you hammer it all hell breaks loose! It really seemed to open it up alot. And I'm very happy with the sound it produces. At first the pipe wouldn't fit onto the existing header pipe so I had to make my own expansion tool to open up the hmf inlet after that it went on fine. I'm very happy with the results it runs like a sport quad now and the throttle response is awesome.

 

glad to here you like
it

 

did you order that as a kit that included the correct jetting for it?

 

no, I ordered a dynojet kit from highlifter it came with a whole kit of main jets. It includes a new needle and slide spring ( makes the quick throttle response. I then ordered the hmf pipe and quiet core from world wide peformance. It made a huge difference in performance and with the quiet core it is still a little loud but it sounds good, I just rode sixty miles yesterday and it never missed a beat. I recommend this setup for anyone with a vinson