Racing cylinder 136cc MALOSSI PK XL , direct or casing?

wich works best en has the most plug en play power with 25mm malossi carb./ reedvalve?

1) modifed casing intake......with setup

2) direct intake.........with setup

setup

worb5 shaft

parmakit ignition

25mm carb. reedvalve 

2,86 red.

JL/ Polini Evo Exh.