JDM NS400R Exhaust restriction collar

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Re: JDM NS400R Exhaust restriction collar

Post by luggy » Fri Mar 09, 2018 6:57 am

as far as i can see , i think it is a ring to fight temps and has nothing to do with restrictions, removing it is not always a good thing as the reducing the exhaust speed flow, may not give to desired effect !
gravity is an extreme painful thing !

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