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I wouldn't bet on a engine sound change with a ECU tune.
I agree on the fact that if you start modifying the GT86 it's better to get a Ecutek cable and contact a company willing to give you map upgrades as you go on with mods.
I would fit headers and HFC on the front pipe + specific map as first engine mod, maybe adding a good intake.
After that, there's only super or turbo charging...
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