[ionit3]

High-Tech Collectors
Technology to make a good header has been around for 30-plus years. These days, making a top-notch header is very much a question of refinements to eek out whatever potential may be remaining. One area of research that has paid dividends in the past decade is in the collector design. Example number 1 on a system built by Kook's Headers is a 4-into-1 merge collector (arrowed). Dyno testing this type of collector, versus a regular parallel one, shows that the merge collector tends to pull up torque from the lower speed range with ever decreasing amounts, thus delivering a fatter torque curve but not

Another header/collector worthy of note (our example is again from Kook's) is the type shown in photo number 2. This is much favored by Busch and Nextel Cup engine builders. Essentially it is a long 4-into-a-short-2-into-1 system. The parts that go to make up the system between points A and B are shown in the top right hand corner of number 2. About 10 years ago, Flowmaster introduced a collector that converted a regular 4-into-1 system into the system seen here. This was my introduction to testing this configuration of collector. The dyno indicated only marginal gains in peak power. Like the merge collector, this collector style fattened up the torque curve, but usually to a greater extent

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