09 yz450f header pipe?

I just got this bike and the guy I got it from said it has a dr.d header pipe and a fmf silencer. Im pretty sure its a dr.d header because I cant get the oil filter off without removing the header. Im thinking about switching it for a fmf mega bomb. Ive read the dr.d does the best tho. How does the fmf compare? Is it worth the headache to keep the dr.d?

I don't know about the fmf system but I do have a full Dr.D system. It is a tight squeeze to replace the filter. I take the mounting bolt out of the silencer and pry up ever so gently on the header to get the filter cover bolts out. I have done this multiple times and have had no problems.

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