yamaha neos 50 exhaust

hi ive just bourght myself a yamaha neos 50,not the best scooter but it was cheap,does 40mph the first thing im going to do is buy an exhaust but there is so many to choose from i dont no which to go for,any ideas which ones are good or not thanks.

 

yasuni, leovince zx, ginelli, polini, malossi mhr exhaust, pm59, + more, pm360 exhaust ect

 

i just do no which one would be good for my scoot,i was thinking leo vince or giannelli,also whats the deal with these unlimited cdis? thanks