Quote:
Originally Posted by Tor
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. 
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You need a catless header to see a difference in high rpms. The catted headers fix mainly the torque dip, but this is also very useful. Maybe not so much in track, but much more on real life. Regarding the temperatures, I was thinking about a Zircotec coating:
I haven't checked it yet with them, but it looks that you need to ship the header in UK for the coating.