Yes and no.
1) The FZ6 was stock except for a PC3 & Akra slip on.
2) The Buell 1125R was dyno'd three times. Once stock with a PCV, then a full exhaust with PCV, then a custom exhaust and PCV.
3) The FZ1 was done three times, Akra slip on and PCV, Akra and Flash, then Akra, Flash and...