Need Help with new exhaust on WR 400

I have a friend who is parting out his 2001 Yz 250f.. he has a pro circuit t4 pipe on it he says he wants 50 bucks for. Would this bolt up directly on my 99 WR 400? Couldnt pass up this deal/ I have a stock head pipe also. Any help would be appreciated.

 

Also, If this exhaust works, what should i do for jetting/fuel mixture? thanks

Nope.  Head pipes are different diameter...

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