Mr 5 0, thanks that has really cleared up some things. As far as the performance of the big headers, I dont know yet how they will perform. I am just rumming the headers nad turndowns so I think they "scavenging" effect will be there goint down the track. Maybe the outside air will help pull the gasses out. And also, as far as the bigger headers being for higher turning motor's I plan on keeping this one above 5 most of the time. I jsut hope it will last.
Brad
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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