Quote:
Originally Posted by ysu
I'm not sure why you think the gain is negligible. I can assure you it's anything but. Don't just consider the top gain, consider it all across the range, especially with the torque dip gone.
It's so prominent, that my friend said "wow" when he drove my car after the header install & tune. I said the same, btw, but I don't count as it's my car. 
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I believe you that it changes the feeling of the car. But still, I believe the gain is negligible in terms of performance figures. Especially on the track where the rpm are always high. I doubt it would make any real measurable difference in track times.
I'm convinced though that it would make a measurable difference in engine bay temperatures.
I could be wrong on both.