The GT/HO PCM is set to run on 91 octane. Unless you are running a Stage kit it will probably not help to run a higher octane than 91 (but it will decrease performance to run a lower octane than 91).
Now if you could get a Stage 2 Kit with Toys 100 octane will increase performance.
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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