The decibel reducer are more for low end torque for horsepower its not only the throttle body but injectors as well. Are the SE heads stock or did you get them ported and milled to CC. Do you have a dyno sheet to show? Cant tell if I cant see that sheet.
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2007 Harley Davidson FLSTF, 107B Twin Cam Engine, Rosa Cycles Stage 3 Heads and CP Flat Pistons, S&S 585 cam with 4 degree advance; 10:50:1 CR. SE Heavy Breather, Rosa Cycle Crank rebuild and V&H Big Radius 2-into-1
2017 Harley Davidson FLTRU, Stock 107 Milwaukee 8.