what exhaust should i get for my stock engine?

ya i was thinkin toomey to but its the most exspensive out of those three but ill just wait and see

Quite possibly, but also comes with the jets needed for the carb, and is the best all around performance pipe for a stock blaster motor IMO. I have seen, heard, and rode quite a few and loved them all includiong one that was heavily ported!!
 
I think the FMF has a stronger low- mid powerband and may feel better on a close to stock motor. I'm sure you will get a lot more opinions on this.