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To run -no
To get the benefit of a performance exhaust - yes

Never heard of an ECU flash for the Z125, Bazzaz & DynoJet fuel controllers are popular. Of course a cheap Chinese item with a DB killer won't flow much different than a stock muffler.
 

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If you want your bike to go better get a better intake.
The stock airbox and filter are way restricted.
The bike will go better with intake and exhaust but for me the little bit extra with loud exhaust isn’t worth the extra noise.
 

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As for reset of ecu I wouldn’t bother.
If you going big bore kit I would say yes but put the exhaust on and see how she runs.
 

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Only exhaust, you'll be fine as is. Add a proper intake or head (the two weak points of the Z), and you'll want a proper tuner....
 
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