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They are in my 434 which is "projected" to make around 700 hp flywheel. I intend to add a 200 shot on top of that too. Erik at HK Enterprises suggested them for me so that's the route I went!
Im not sure about the compstars but I have seen eagle and scat H beam rods in the 900rwhps area with boosted motors.TSPs TT c6 had scats and it made almost 1000rwhp