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In short,(and I already wrote that a couple days ago!)its a valve that partially close up the exhaust at low revs to produce more torque by creating a back-pressure effect and opens up gradually to let the flow of gases out easily as the rpms go up.

Toruqe-producing device used by almost all the big manufacturers.
 

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Discussion Starter · #6 ·
atleast thats what the guy told me when i bought the bike from him, but the exhaust still makes the poppin sound from the exhaust on deaceleration
 

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wheres the aux rev limiter?
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the popping is caused by the AIS sys. not the exup valve.
 

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wheres the aux rev limiter?
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Yes, buy some AIS block off plugs from Graves motor sports and install them , it will almost completely stop the decel pop.
 
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