2 inch exhaust??

I don't understand where people get this whole "Back pressure" term. I must be one of the few people who know there is no such thing. Velocity of incoming or outgoing air is what you want to build torque at any given RPM. Skipping the intake velocity charge as that gets into another aspect of this. Exhaust size and length is used to tune power and sound. Obviously if your driving a 500HP big block only on the track, go for the 3 inch. But if your driving a mild 360 on the street go for an exhaust pipe diameter that flows well in the rpm you typically drive in. I've heard so many people ask me why their car got slower after putting on a dual 3 inch system. Isn't it obvious? You don't lose "Back pressure", you have just effectively reduced your exhaust velocity. Which in turn reduces the torque in that street RPM you drive in. 1800-3500 rpm. Velocity,heat and exhaust pulses tuned correctly build torque. Now if your taking this mild 360 to the track on the weekends and it's also a daily driver I would say find a middle ground in pipe size. But BACK PRESSURE is not a thing.