Interesting! I put a brand new 450 EXC can on my 'F' and it blew over 96db on FIM sound test. More like 97-98db measured 20" at 45 degress angle at around 5500-6000RPM. I think that the european EXC cans are different than what we get in North America - especially if they are passing 94db.
Anyways, I am going with a Leo Vince system with 94db insert. I will us at AMA ISDE qualifier in Idaho City next weekend. Will post sound / performance results when I return.
Would appreciate any suggestions on jetting with this system. Currently using JD jetting - red needle -5th position-175main-40pj-2.5as, plus 60 leak jet mode in float bowl. Elevation at 4500' and temps. around 65-75 F.