250-500cc Procircuit exhaust on my 2009 WR250

Hi
does anyone know what jetting changes i will need to do after installing a Procircuit exhaust on my 2009 WR250?

this is the system i got :-
http://www.cafehusky.com/forums/showthread.php?t=9039


my bikes jetting is stock with the standard carb
it starts resonably easy since installing the setup and runs well, just woundering if anyone has any pointers like air mixture and needle postitions

thanks

I run a PC on my '04 and I did not change jetting at all.