Hopefully that mod to your billet mount helps. Maybe this is another possibility. Our Cavalier has a passenger side lower dog bone mount that goes between the engine and subframe. It looks like it might help prevent the movement shown in your vid. Our car does not have the 2.4 option but wondering if the 2.4 Cavaliers had that mount too. If they did, maybe you could adapt that in somehow? The dog bone is (was in 2018 anyway lol) available from Prothane with poly inserts. Might be able to bolt the engine side mounting stuff on your engine from a 2.4 Cavalier then fab the subframe side? Rock Auto shows the part for a 2.4 J-body. They call it a torque strut. Would help direct the motion into the subframe instead of the body to help with NVH too possibly.
Watched the fly-by vid. and man that thing moves. Assuming that was not a WOT pass either.... Sheesh, that was crazy and the exhaust note is killer.
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