That pipe looks a little different than the stock 85 expansion chamber I have. It is not on my 250r. I have a complete FMF system now. I am waiting on my big bore head gasket. My bike is either bored to 295 or 310cc. The head gasket went bad and I installed the wrong one (stock) what a fiasco! I'll take some pictures of my spare stock expansion chamber when I get a chance.
06 Yamaha Bruin 4x4
04 TRX Rancher 400 AT 4x4 GScape
86 ATC 250es Big Red
84 ATC 200s (31 yrs running strong)
13 F150 4x4 SuperCrew 5.0
00 Excursion V-10 lifted with 35s
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Gone
07 CanAm Outlander 650, 05 TRX 450R, 85 ATC 250r, 01 Kawasaki KLF Bayou 220 , 02 400EX, 85 ATC 350x, 84 ATC 200x, 85 ATC 350x , 98 KLF Bayou, 86 ATC 250r