Blacksmith
Registered
I have the M4 gp mount exhaust (I know, Busas are meant to have duals I didn't put it on) and I like the look and weight savings but I'm wondering if the factory installed stage 1 quiet insert restricts airflow and therefore power. The inserts go from a Q1 to Q9 but I can't find info on what's better for performance vs sound. I wont go very loud just for an extra pony or two but I'd like to know what the options are