Theft mode will basically not let your engine start, it'll just keep trying to crank over. Valet mode is up to 2500 rpm and 25 mph max.
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 '12 370Z + Sport | Stillen Gen3 Intakes | Stillen UD Pulley | Motordyne M370 | FI Exhaust | FI HFCs | 4.08 Gears | Uprev tuned
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