2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 63Get this manual
FRAMEBODY PANELSEXHAUST SYSTEM INSTALLATION Loosely install the following:new gasketexhaust pipetwo joint nutsnew gasketmufflertwo collars, washers, mounting bolts and nuts '04-'05: MOUNTING BOLTS COLLARS
SPARK ARRESTER
GASKET MOUNTING NUTS EXHAUST PIPE JOINT NUTS MUFFLER After '05: MOUNTING BOLTS WASHERS COLLARS SPARK ARRESTER