Factory boost is at 6psi. If your running your vehicle on 98RON then it will be a waste of time. If your running your vehicle on 95 fuel then the 8psi pulley is recommended regardless of extractors.
For the "HOLDEN SUPERCHARER BOOST UPGRADE for SUPERCHARGED V6". What’s the factory boost rated at? Some websites said 4psi some 6psi. Would running an 8psi or 9 psi pulleybe a safer option or merely a waste of money, also im looking at installing extracto
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