Most all SC kits I have seen are still on stock block, a few have upgraded for different reasons but the amount of power the base SC kits put out is within a safe range.
Just get a solid tune from a good shop, supporting mods, and keep up with proper maintenance and the kit will be good to you. I have the GTM stage 1 SC with 76k miles on the car and almost 60k miles with the kit.
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