Your does sound really nice!!! but it's basically a custom exhaust
Here are mine:
http://www.youtube.com/user/zuku26#p/u/0/9S9CsIr0IVI
http://www.youtube.com/user/zuku26#p/u/1/_JRyUOQ76t4
http://www.youtube.com/user/zuku26#p/u/2/0IC2NvmzHAY
I need to do a Drive by one as well. When I get my car back I will.
It sounds much louder and deeper when actually being driven
I want to hear your drive by