Wondering what exhaust to get for my beta 4t. Anyone know the difference between the beta titanium factory and the titanium arrow exhaust's? I.e.  Power. sound. Weight. General product. 

A friend has fitted the Arrow one to his bike it fitted very well, gives a slightly different I think better sound and definitely increased performance.

Factory & Arrow exhaust pretty similar. Louder & more power than standard, albeit not such a smooth delivery. They all still melt your pants due to the lack of front heat shield. Good for 250's. I used a standard pipe on my '16 300 4T Factory, which calmed it down noticeably. Quieter & smoother, but not to everyone's taste. 

PJW123, sounds like you should have bought the standard. More performance is the why to buy the factory. Either pipe works fine and you could get the full exhaust from arrow. My son just loves the power of his.