I can only offer up my opinions based on what I've ridden-
Jardine- Cheapest sounding, looks good, has a tinny zingy sound
Leo Vince- Really loud, but rather exotic sounding midrange.
Akrapovic- Quietest, but deeper, more professional sound all around. My full system is louder than the leo under 5k RPM
FMF- Sounded like a louder, smoother, deeper stock across rev range
Two Brothers- Really loud, kinda raspy. Ugly, but it's good bang for the buck if you want to make a racket.
Haven't ridden with the ones you questioned, but I thought a free bump couldn't hurt.
Jardine- Cheapest sounding, looks good, has a tinny zingy sound
Leo Vince- Really loud, but rather exotic sounding midrange.
Akrapovic- Quietest, but deeper, more professional sound all around. My full system is louder than the leo under 5k RPM
FMF- Sounded like a louder, smoother, deeper stock across rev range
Two Brothers- Really loud, kinda raspy. Ugly, but it's good bang for the buck if you want to make a racket.
Haven't ridden with the ones you questioned, but I thought a free bump couldn't hurt.