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Sounds like an exhaust issue to me aswell. When the exhaust gets hot the metal is expanding and maybe letting some cool air in, or hot gas out.

Sounds as if the inlet manifold is warping when hot or something similar. Is the ignition coil getting too hot?

Sounds like you have done a bit more damage than the Panhard.

Shocks don't affect ride height even with no shocks the car will sit at the same height but sounds like at least one is stuffed if the...

^^^ What he said mate, Jack the front wheels off the ground from under the diff. Then check the wheels for wobble. Simple check should take about 2 minutes. Good place to start.

Welcome to the forum mate.