Mg zr lowering metro cup

Hi

I have the mg zr 160 suspension set up .

I am thinking about buying a mgzr 1.4 and racing it in the mg metro cup next year I would like coilover but budget will not stretch .

Would putting lower spring on the mg zr 160 suspension lower it down the same as mg zr 1.4 ?

Would the 160 shocker be better than 1.4 zr ?

I think the rule is the car must pass over a 115mm block without touching it

Ideas please

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