You should really think about the whole exhaust system from engine or header back... A option maybe to run with Motordyne ART pipes with Shockwave Dual, which allows you to have a HFC after the Y-pipe. The Shockwave Dual is Motordyne's second masterpiece because of it's modular design and the first been the ART pipes... Although there is a technicality with that arranagement as the relocation of cats is deemed illegal, but I'm not sure if they will spot that out without a full undercarriage inspection.
Anyways, there's been many people getting Berk HFC, but I'm getting Kinetic HFC. You should join G35driver, they have a lot tech support and information.