I had a similar problem with the Z-speed undertray and the Hotchkis bar. I removed the nipples due to the interference, but then I discovered as soon as you hit any hard transition the sway bar comes down and smacks the undertray. After a few good hits like that the undertray will be bent all out of shape. Might happen with a stock bar as well, can't say for sure. I have the AM Performance pan, which relocates the drain plug so I have the same issue with the trap door now.
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