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chickara is owend by hedman i believe. the torq-step is due to the fact that they start with a smaller tube at you exhaust opening and step up the pipe size as the lengh increases. the idea is to get a more complete burn and scavange all the residule gasses out of the cylinder and bring in more fresh air/fule charge. if you already have a tri-y header then this probebly wouldent help much. if you were starting with a stock manifold then it woulden't be a bad choice.
use the cash on something else like cams if you are looking for more power.
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