Originally posted by ButtonPuncher:
... that ZXtuner header worries me. It doesn't have a flex section anywhere. If your muffler hits something, isn't there a HUGE chance that you will crack the weld on the head flange?
Doesn't the Zetec have a flex pipe under the car, approximately where the V-6 has the cat??
Frankly, the only problem I see with the zxtuner 4-2-1 header is that you'll need to buy a high-flo cat to stay emission legal, but that's no big expense. And if you're clever, you can put off adding the cat for a little while... by keeping the car off road only I mean... 
Must be that jumbly-wumbly thing happening again.
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