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I find it hard to believe that all of these aftermarket companies have been lying to us this whole time about the few HP gains realized by adding a less restrictive intake. That being said, the last SC vehicle I owned had a wastegate that would dump extra PSI generated when adding bolt-ons, not necessarily enough to counteract any small gains, but generally a tune was preferred when modifying, but not necessary.
I can believe 10-20 HP added to the crank as even at 20+ that's a modest 3% gain from stock (much easier to believe than those outlandish claims by Honda guys that an intake added 50 HP to their 2.0 liter 4-banger) . Also, while I love peak HP/TQ numbers those aren't necessarily going to give you the full picture. If you get a small increase across the entire rev range it's going to make an improvement with each gear shift. All things being equal, a tune will help dial in the power, but a less restrictive intake won't hurt. I don't buy that as soon as the ECU detects more airflow that it can lower the airflow somehow as the whole purpose of the unit is to provide more fuel so that the A/F ratio is consistent.
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