'06 WR450 header pipe diameter

Bought this bike a few years ago and decided to put an FMF slipon exhaust because the stock pipe is loud. I suspect someone has tampered with the internals because I don't think the stock pipe should be this loud. Anyways, the slip on inside diameter is nearly identical to the od of the header pipe. Is there a chance that someone has put a YZ exhaust on my bike? Not sure if the header pipe is slightly larger on a YZ versus a WR. I have purchased an enlarging tool to open the id of the slip on but it may be just as easy to find a stock WR header pipe and swap it out. Anyone have the OD dimension of the stock WR pipe on an 2006?

Any help would be greatly appreciated.

Bob

Yes the WR headers are smaller YZ header will fit or buy a Power Bomb of Mega Bomb.

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