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What do you mean like a true tac or something?, and the only way my tyres will wear stupidly fast is if i put my foot down and be stupid which is very rarely, beside i can usually pick up a set of stockos for a carton of piss.
Having the diff locked will mean it will chatter at low speeds which will wear tyres. Something the cops now are pretty clued on with.
You should definitely get it down the 1/4 mile, very interested to see what it does being auto, I'll have almost same mods with a manual but, and still stock diff aswell for now