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Message: <blockquote data-quote="ossagp" data-source="post: 201225" data-attributes="member: 1650"><p>we have them for hondas and yamahas.  no difference on the 250's two strokes and found no difference on the  yz 125 compared to stock.  the last one I owned that was on and rm was for a 465.  noticeably slower anywhere other than off the bottom from my modified stock pipe.  I no longer had an unmodified pipe to try with it.  Compared to a dr d for a 450 yamaha,  it was disappointing in that the 'Doug' pipe actually makes some difference.  crf 250's ditto,  though I didn't try a ti.  compared to an offbrand silencer on a stock header ZIP.  It's a quality build,  usually louder and if you are pig rich on your jetting will make about anything run better if use their mufflers which seem to lean anything out.</p></blockquote><p></p>