I had this same exhaust on my 08 250 I believe my jetting went as follow 98 jet and clip at the 3rd ring and 3 turns out the stock jets are 98 as well but the dynojet jets are a little bigger. I played around with a 100 jet but it just dident work out for me you could do a search and find a lot of good info
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08 250R: sportisi VR full exhaust, Dynojet, custom seat, kleen air rmvd, rim tape, grips, fender chop,zg db windscreen,k&n air filter,15t front sprocket,sportisi-usa clipons,solo seat cowl
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