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Any suggestions on whose subframe connectors would be best for this application?



Best would be ones that require cutting and welding to your floor, period. Anything else would be a compromise. There are bolt on ones that don't touch your floor and just attach at the front and rear subframes. Although with a 528 and a stick shift I would at least weld those at a bare minimum. I would suspect bolts would tend to want to wallow out the holes they're in and with bolts there will always be some flex.