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Same here. The 17" drag radials on the rear make it 10 times worse. With the stock rears, it barely moves and I can pretty much just keep the wheel straight, but with the drag setup (rears only) it's all over the place. I have to actually make steering corrections to keep it in my lane. The weird part is that it doesn't always do it and it's really bad sometimes and then barely wiggles others. It seems to be relative to how smooth and even the surface is. Both my local track here in London and Clay City, the rear was all over the place. Both tracks have older surfaces that is likely not nice and flat. Bowling Green completely resurfaced their strip and the car tracked perfectly straight every time during Camarofest.
If it's being caused by uneven surfaces, unhooking the front sway bar might fix it (at least at the strip). These cars are super stiff and it doesn't take much of a dip to unload one of the rear tires. So at full throttle, it makes sense that it would take way less to cause one tire to have less grip than the other. I just might have to give this a try one day and see if it helps.
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