a sleave will last 200 hours on it before u have to bore it out..about 3 sets of pistons then u bore it out..i would recommend new pistons but leave it same bore
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2005 YZ250 - FMF Gold Series Fatty Pipe, Titanium 2 Silencer, UNI Filter
2006 YZ450F - White Bros Full Carbon Exhuast, UNI FIlter 
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