Fmf powercore 2 silencer and carb jetting???

we have 200 acres to ride on and being here in Arkansas no one cares but I can see all that and I will go ahead and redo it tom since its talking about raining anyway and its cold. my buddy has a kfx 400 bored to a 440 and a yoshameria pipe and I am no where near as loud as his but like I said we are in the middle of no where
 
the power core should fit on the stoke pipe since its a rubber clamp that connects them and as for the rejetting its has a lot to do with temp and altitude where you live and all but I have family that races dirt bikes and he deals with all my carb stuff but I am trying to take over and not doing so well and I think I will tear up more than I fix but you have to learn way or another.
 
I got to bolt it in, and run it....... its pretty sick!!!! its got a deeper sound to it than the stock (kinda upset about that) but it has a LOT more top end speed and acceleration!!!! i was in 4th and i guned it, and almost fell of the back :D lol its nice tho.... maybe in the future i will get the fatty pipe ;)
 
some pics of it.... i will have more tommorow
 

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