tested this a little while ago on the ute ... factory to aftermarket 3" pipe .... made a 5rwkw difference.
on road rolling performance was increased as well ... torque and response was better as well.
Definitely worth doing for sure.
Oh ... and this was on an AUII EGAS engine as well with the 50mm mixer ring in too.
EDIT: I also have the Tickford snorkel and Redline panel filter in the standard AU airbox.
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