250-500cc New pipe 09 WR 250 , E=Mc2

My local Yamaha, Honda, Polaris dealer sold me the gnarly for $199 + tax but no shipping. I was surprised how hard it pulls clear to the top like a 125, my stock pipe would not do that. I rode yesterday for two hours in the slick mud and couldn't get a hard pull so at the end if my ride I took it down the street to open it up and clean it out a bit. On the 1st pull it blubbered rich but then cleaned up and screemed on the next two 5th gear pulls it pulled like it never had before. I think it's jetted perfect under normal conditions but in the slick I might go 1 step leaner on the main.