Umm....
Lets hope no one else reads this, I am in a good mood so I will be nice :p
First, your friend is an IDIOT.
Second, please don't be an idiot like your friend.
Okay, loud bikes does NOT equal more power.
Why would you want to make your bike louder? Do you realize the negative impact that will have on our sport? Do you realize how many riding areas we lose EVERY day because loud bikes and guys who are idiots on bikes.
Not only is a loud bike irresponsible but it serves no purpose at all. Now for your friend who "removed" his packing, I hope he realizes how much power he just LOST by doing that. I poorly packed silencer or NON-existent packed silencer will effect power greatly.
Do you really want to modify your exhaust and have no where to ride your bike because you got all the riding areas shut down? It just makes us all look bad man.
take care