Save the trunk floor!
As has been stated, a straight across style is fine with stock ride height. Typically about 2" of shock travel is lost, as the upper shock attachment point is lowered when using a bar. This is of no consequence as there is more than ample shock travel on a stock car.
When the car is lowered, then things rapidly get crowded. The center section of the rear axle can strike a straight shock bar, and room for exhaust pipes (especially fat ones) where they pass over the rear axle becomes a big issue.
The shock bars that curve well forward in the center allow more space on lowered cars.
We modified our homemade shock bar twice for differential clearance, and increased shock travel, as the car was lowered.
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