I was running my barely broken in Red Dot against a barely broken in Sirio this sunday, both on Kyosho's RRRs and the red dot defenetly has more top end, and the bottom end is just as good. I would say for the price get the red dot. You can get 2 red dots for the price of one Sirio. I do recomend you get the Picco 2607 with the red dot, as it runs best with this pipe.