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IMO The amount of torque you give up at the lower end of the rev band with a single plane manifold is minimal - something like 30 ft/lbs - but the gains are way bigger at the upper end of the rev range over a dual plane manifold.
If you are going to set the car up for the track then a single plane is exactly what you want.
Cobras have a huge amount of torque - in fact, most could use a little less torque on the bottom end.
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