Exhaust for hig speed 166

hallo..greetings from malaysia...i owned a vespa sprint v with malossi166kit....
which exhasut that you suggest for me to buy for a highway and long run trip?i'll need an exhasut that have higher top speed and less vibration in high speed..the exhausts that i have in mind is JL right hand,JL left hand,SIP Performance left hand, and PM exhaust...which of these would you highly recommend to me...thanks....