There's a thread around here somewhere with some real results. You will want to re-tune after installation of any major part for maximum benefit, but yes there are results on a tuned car.
I think it's a decent pickup in area under the curve, and what little people have lost is so close to redline it hardly matters. Exhaust and intake is worth more, but if you're trying to squeeze all you can from NA bolt-ons, it's another item on the list.
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