LOUD!.... and you should rejet... they are very open...
If you don't want to rejet.... try a Harley shorty, fully baffled... it might run better with a rejet,.. but it will survive if you don't... and has a much better sound...
Info here...
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1298689417Rejetting is much simpler with a well baffled muffler...
... so, you'll have better running, and performance, with less trouble...
A Jardine, without careful rejetting is nothing more than an expensive noisemaker... your performance will drop...