If I changed out the exhaust and deleted the suitcase then it would be a no brainer to add a rear bumper belly pan IMHO. Basically cheap insurance.
Of course if your rear bumper starts sagging and gets out of alignment due to wind resistance, it could be resolved with zip ties as shown in other threads.
Top corner of rear bumper not flush to fender
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2023 LT1 M6 Coupe - Black (GBA) on Black (H1T) - Build Date: 8/22
Blade spoiler (5ZU), Recaro seats (AQJ), Technology pack (Y3W)
LT1 PBC engine - Shane Parker
Current mileage: 400