2007 450er how loud

[edauth]

I am getting the sport series slip-on, how loud will it be with and without the quiet core and will jetting need to change between the two. And what is a good adjustable needle for it, I have heard a needle out of a yz450f will go right in and what clip should it be on? Thanks in advance for the help!!!

[450rquadrider]

I have the sport series slip-on. It is pretty loud with the quiet core out, you can hear it echo off the trees. It sounds great though. With the quiet core in, it is much quieter. I did not rejet it when I put the quiet core in and it ran well. You definitly lose some power though but if you gotta run quiet, it does its job. I believe the quiet core knocks the noise from 104 db to around 96-98 db.