Ok.. update: Just spent a bunch of money at rocky mountain atv.... again... getting many parts, some anti monkey butt powder, cool riding pants, and assorted jelly beans (jk, no jelly beans).
But I did notice a few things. The FMF is NOT for my bike. I still couldn't find a part number. But the header end measures 2 1/8 inches, while the stock KDX port isn't even 2 inches... so that aint going to fit!(that's what she said

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-I ordered some stock mounting things for the exhaust, like the header springs, and the front mounting cushion. I think i am going to keep the stock pipe for now.
-Ordered a skid plate, and chain breaker tool so I can mount the chain and sprox from the last order (lol.)
-QUESTION: does the stock rad shrouds mount directly to the radiator on the bottom front bolt? In other words, there is a metal tab that creates a place for a bolt to thread into on the bottom of the radiator.. well there is an identical spot on the top as well.. is there two of them normally? I may have to get a picture to explain what I am asking... basically the PO had just run a bolt and nut threw plastic and shroud and cinched them tight, all ghetto fabulous...