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My 2017 SS A8 with just a 17" MT on back, plus a (worthless) drop-in air filter inside the unmodified stock airbox, went 11.9@113 in the autumn (1.76 60'). Before this I had run some 12.0s at 114 (1.83~1.85 60') with the bone stock car on the stock runflats in the weeks preceding this run. So for me, I only gained around a tenth from the DR and the (now I know worthless) air filter on the otherwise-stock car.
No question the stock TCM hampers performance of an SS/LT1. For my 2017 T87a, once tuning became an option from HPT, cost was 200 to unlock plus 200 for the credits. That's worth it IMO if you're tuning the ecm anyway and therefore already giving up the warranty. Not sure what the HPT price is on a T93 like you have, but honestly the trans tune helped my car a lot, and I'm talking bolt-on level as well as power adder. Example, with just 17" rear DRs (no skinnies), flex fuel ecm and tcm tuning, the aforementioned worthless air filter, a useless v-max ptb, and a driveshaft loop (extra safety but did add ~6lbs) I ran 11.3@119 with a 1.64 short time.
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