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My old 420a turbo loved 20psi with MS and the stock ignition. It should only run 17-18* WOT and in my opinion thats not enough. That was 8.8:1 and a 60mm. Just had to run it a bit rich in the part throttle boost erea so it don't knock before the timing starts to retard. I don't see why you can't put down 400+ in the 25psi erea with a good 50 trim on 91.
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