Inlet pipes,ported TB,filter

Hi guys.I think to start modding my astra z22se.What is the best intake mod,vectra c scoop with panel filter+derestricted airbox(already have) ?
Is it worth to buy viper induction kit ?
Is the vectra c 3.2 scoop bigger than others ?
I will port my TB,but can i use 68mm or i will have problems ?
And from where to find breather filter for
the oil cap place ?
Thank you.