Kiwi read this info from ANdrew Buck about their 44 Magnum SBN
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Through the years our SBN Magnum carbs have gone through a few design changes such as insert radius, fogger nozzle, and throat angle. None of these are as important as fogger nozzle length. By changing the position of the end of the tube we were able to increase signal strength at the 70 to 80% throttle position. This made our highest signal strength at that position and not WOT. This improves acceleration and corner speed.