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How are you connecting the steering arms to the car, if they are at a different arc to the lower arm then you will introduce unwanted bump steer,
ive tried to find the link to his project but for...

Might be worth speaking to chip (if you know him)
he used to run nova front legs on the back of his mid engined nova but suffered with horrendous bump steer issues, he swapped to mk4 astra hubs and...

Are you using front hubs on the back?

I ordered a pair of fibreglass wings for my nova and paid via paypal , after nearly 2 months of not receiving them i contacted Chris who said his website hadn't passed him the order - it processed...