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98 ECM isn't a problem to tune until you get above 14-15 psi of boost due to the fact that they cannot be upgraded to 3 Bar SD. They can however be upgraded to 2 bar sd and tuned like that with no issues.
They can also be tuned N/A regardless of set up with no issue. If someone tells you they can't tune your N/A set up because it's a 98 PCM find a new tuner.
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2000 ws6
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