The sound of power being wasted.
You have to tune the bike, prefferable on a dyno, after modifying the exhaust. Most of the tards riding around with straight pipes have actualy lost a couple horse power.
My BMW is quiet to the point where you can stand a foot away, and not know that it’s running. She still manages to set off car alarms. Blame the idiot car owners for setting the things to hair trigger.
anti reversion pipes like my old supertraps reduced noise while maxing out those horses especially after replacing my cylinders, pistons and porting the heads...I used to give the those rice burners fits at traffic lights with all that low end torque but many got me after a 1/4 mile with their top end. I miss that 1200+