Which is the loudest exhaust?

I own a 2001 honda shadow spirit 750 and it seems i can only find these exhausts for my bike. Which one of them sounds a loudest? If you know more about each exhaust please let me know so i make the right decision. Thank you.
Cobra STREETROD SLASH-DOWN EXHAUST SYSTEM
http://www.motorcycle-superstore.com/7010/i/cobra-streetrod-slash-down-exhaust-system
Vance & Hines STRAIGHTSHOTS PERFORMANCE EXHAUST SYSTEM
http://www.motorcycle-superstore.com/6994/i/vance---hines-straightshots-performance-exhaust-system
Cobra STREET ROD EXHAUST SYSTEM
http://www.motorcycle-superstore.com/6606/i/cobra-street-rod-exhaust-system
Cobra Classic Slash-Cut Exhaust System
http://www.jpcycles.com/product/ZZ44250#!

Pype-Pype Bombs are nice, have them on my Mustang GT. They are brutal without being overbearing. )

Your showing your age!

Is 'loudest' going to make the bike perform better?
Or are you just trying to make it 'seem' to be better because it's louder.

Straight pipes are the loudest and if we pull up to a stop light somewhere I'll know you're a squid looking to eject extra ink to protect yourself from being eaten.