Yes, should 100% get a race ECM or attempt a remap.
I run race ECM
Stock will run ok, but you probably won't notice any power difference. Just a lot more popping on decel
Hawk is great!
Open air box makes it louder also, you hear much more noise since the motor & valves noises are essentially under your crotch & in front of you.
I wear ear plugs with my 9 set up as you seem to be planning.