The stock carb on your bike is a Mikuni BS40...
You can get a selection of sizes of jets from Lancer here...
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1336741909.... or,.. try your local bike shop... and buy one incremental step at a time, for $5 a pop...
Mikuni is the most common carb used on any bike... jets are easily available...
Lancer has a pretty good deal on this assortment....
(7 jets, 3 pilot/4 main, plus extras... including washers for needle spacing )...
For a Jardine,... I'd probably start with a #155/52.5 and 2/3 spacer... especially if you are adding a free flow air filter...
I don't recommend Jardine mufflers,.. but since your bike came with it... it's your choice...
They are very loud, and open... you will lose powerband and low-end torque, in exchange for peak HP... and they are harder to jet for smooth running...
You can always buy a Harley shorty take-off for $30 and have a less peaky, and quieter bike... and sell the Jardine for more than that, to someone looking for a jackrabbit, noisemaker...
... (that might have been slightly mean)...
...