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Re: better than headers or just not worth replacin (archive)
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Posted by XBeteNoirX on August 09, 2000 at 03:35:48:

In Reply to: better than headers or just not worth replacing... posted by necessarily tow hooks.... on August 07, 2000 at 08:14:59:

You are correct, the tube lengths of a Tii header are not equal length. There is absolutely no rule that says that they must be equal length.

Equal length headers are used when the engine designer intends for all cylinders to tune at the same RPM point. This will produce a higher torque peak but will narrow the usable range. To obtain a broader (less peaky) torque curve the tube lengths can be altered to provide multiple tuning peaks. Race engines will often use equal tuned length headers but the peaky torque curve then requires a five or six speed trans to be used. Street engines will often use staggered length headers to provide a flatter, wider, more driveable torque curve.

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