Search, search, search.
You would need a CAI as well as the pod filter. Only CAI I am aware of for GC8's is those by APS -
www.airpowersystems.com.au. However, there are more.
APS ones come with a pod filter. Up to you if you want to keep it.
Why K&N? Run a search as there was a thread that compared all the pod filters - Apexi Power Intake topped the list for filtration and flow.