I have a yoshimura duplex full exhaust and my carbs have 146 main jets with the stock needles and airbox. When i decelerate i hear a popping noise. Does anyon know what could be causing this? the bike run's realy well. I can tell a difference like night and day. P.S......Dont try the Graves airbox is is worthless for dragracing, it kills the bottom end. It also makes the gastank stick up.