T5 jetting

Schaltroller / Classic Motoscooters Vespa Largeframe
1

I am going to fit one of the torquey T5 exhausts to an otherwise standard T5. What should I upjet the carb main jet to ( standard 24mm carb)

Also which would be the better pipe for a non kitted T5 the revvy one or the torquey one.

 

Thanks

Andy