300/440/550 650sx intake upgrade

Ok,, so I am looking to upgrade my 650sx intake . I seen an adapter being sold to fit a 44mm carb on the stock or should i not mess with it and replace the manifold completely. Does the adapter not really work , i suspect the stock manifold will still limit the airflow.
 
contact or check out the ski clinic, they used the offer in exchange of your oem intake manifold , bore manifold + adaptor for fairly reasonable price...
 
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