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Up to stock boost I think the OEM ABV is adjustable just take the sticker off the top and melt the wax out of the centre of the ABV and there should be an allen key bolt you can screw up and down. It won't gain anymore than stock boost levels but can lower the boost<_< which is actually pretty useless really.
There is of coarse the aforementioned rerouting the vacuum lines known as the ABV mod which does help out. Google it and you should turn up what you need. What boost are those mazda chargers capable of anyway? just curious.
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