Rejet for Dr. D Exhaust??? 2001 YZ426

Has anyone had to rejet their 01 426 for the Dr. D exhaust system? I'm running into troubles with mine and they say there is no reason to rejet.

Taking into account there have been no other mods(cams, piston, headwork, etc.) there are very few exhaust systemsbon the market that would require any further jetting changes IF(BIG IF) the bike was properly jetted to start with. JMO Tdub

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