The consensus is that, between CAI, test pipes/high-low cats and cat-back exhaust, any 2 are fine without a tune, the ECM will adjust to compensate. All 3 mods OR long-tube headers alone will require a tune.
That's not to say that you can't tune a car with no mods. You will see an improvement.
It sounds to me like either something else is going on, or there are more mods than just the Gen III's...
Kirk B.
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