The HMF is 98 db.Pretty loud.
The HMF doesnt come with the quietcore thats optional.I tryed it one time and didn't like it made little difference.But its a must have if you intend to incert the spark arrestor.
From what I heard around the time I got my pipe was that HMF Inc. was waiting on the people whoever they are not sure to get there spark arrestor certified.It probably is now.

Here is a kewl sight that gives the db's and reviews of almost all the pipes for the z/kfx/dvx 400's.

z400 pipe shootout

 

The spark arrestor is approved by whoever had to approve it. It is legal. I have to order mine now.

 

I had my Ct pipe tested it was 94db.

 

I have recently bought a full Scorpion exhast kit worth £400. i have not fit it yet as i want to prove to myself i can compete in races first with out. I am competing with a guy with the same quad as me but he gas this Scorpion exhaust on his z400 and compared to some other exhausts this is, i feel is a good brand to go for. The sound from the exhaust is intimidating and the difference in power from stock to modified is definatly noticable...


Have fun buying and dont spend too much...