Ok so by reading the title you proably already know the ???'s So heres what I know; the HMF peaks at about 8,250 rpm at about 46hp, and without a quiet core the HMF is about 105db. Ok so heres the part I dont know, what and where does the Sparks pipe peak at? Will I be able to pass a 102 db test on the Sparks? The only stuff I plan on doing is an exhaust,pro design filter(w/lid off),and have my local dealer jet it and retard the cam.
Thanks in advance for any advice on this.

 

Anyone.

 

I would look at the HMF I had a red one on my 450. Looked good and was powerfull. I had the same mods you plan on doing except for the cam. The bike ripped!

 

When i was riding one day a person on a yfz pulled up next to me with an hmf, that quad was very fast and sounded much better than mine, i would go hmf