He doesn't want him to use it on the street because its a kill tune specifically for 1/4 and the mph you'd run in a 1/4.
These cars if you hit 6th gear and keep going on a spicy map will delete a rod, piston, etc. So if you're racing on the highway and you start getting into the 150mph plus races its over. The rpm drop from 5th to 6th puts a ton of load at wot. All the heat=rod deleted
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