It improves power by upping the psi of the fuel, you can either adjust it down for better mpg or up for more power, but dont adjust it to much, its like a boost controller but for your fuel, if you up it it gives more power, but if you go to far it will cause damage, at a guess the mg zs standard fpr would operate at 3 psi like most other cars, so 4 psi would give the safest best throttle improvement
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