Most factory tunes on stock ECUs can be improved on most cars. I have a 91 turbo MR2 making 334whp on the stock ECU with a Precision turbo. The stock ECU adjusted fine and AFRs barely reach 11. I just figured in this day and age, with the technology, stock ECUs should be able to handle simple mods without guessing. I mean it has all the data it needs to make the "guess" a very educated one.
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