Well done. Now, prepare to watch your fuel consumption increase...
...not coz the pipes automatically use more fuel...
...but coz you'll be rolling on and off a lot more just to hear the "rap pap pap" and "wap pap pop", as Mark described it.
Although, I'm not convinced it sounds like that...it's more a 'chiggerchiggerchigger' as you get on the loud handle, although that's as much from the airbox; the zorsts provide a bass backing to it. And on the over run, it's more of a 'prupprup-prup---pop'.
See?
